Update copyright dates with scripts/update-copyrights

I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master

56 files changed, 56 insertions, 56 deletions

diff --git a/time/Makefile b/time/Makefile
index f27a75a115..347f94c5f5 100644
--- a/time/Makefile
+++ b/time/Makefile
@@ -1,4 +1,4 @@
-# Copyright (C) 1991-2020 Free Software Foundation, Inc.
+# Copyright (C) 1991-2021 Free Software Foundation, Inc.
 # This file is part of the GNU C Library.
 
 # The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/adjtime.c b/time/adjtime.c
index 7f8270f732..e791f593a3 100644
--- a/time/adjtime.c
+++ b/time/adjtime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/alt_digit.c b/time/alt_digit.c
index b8abdda7bb..7642941187 100644
--- a/time/alt_digit.c
+++ b/time/alt_digit.c
@@ -1,5 +1,5 @@
 /* Helper functions used by strftime/strptime to handle alternate digits.
-   Copyright (C) 1995-2020 Free Software Foundation, Inc.
+   Copyright (C) 1995-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/asctime.c b/time/asctime.c
index 683e92e937..31657935c9 100644
--- a/time/asctime.c
+++ b/time/asctime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/clock.c b/time/clock.c
index c5dc95a5c8..f641cdd342 100644
--- a/time/clock.c
+++ b/time/clock.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/clock_getcpuclockid.c b/time/clock_getcpuclockid.c
index 0bc52028bb..c148d96c5c 100644
--- a/time/clock_getcpuclockid.c
+++ b/time/clock_getcpuclockid.c
@@ -1,5 +1,5 @@
 /* Get a clockid_t for the process CPU clock of a given process.  Generic.
-   Copyright (C) 2000-2020 Free Software Foundation, Inc.
+   Copyright (C) 2000-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/clock_getres.c b/time/clock_getres.c
index c8f86253c0..4b31893849 100644
--- a/time/clock_getres.c
+++ b/time/clock_getres.c
@@ -1,5 +1,5 @@
 /* Get the resolution of a clock.  Stub version.
-   Copyright (C) 1999-2020 Free Software Foundation, Inc.
+   Copyright (C) 1999-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/clock_gettime.c b/time/clock_gettime.c
index 3a84262a3b..fdeaaca3f8 100644
--- a/time/clock_gettime.c
+++ b/time/clock_gettime.c
@@ -1,5 +1,5 @@
 /* Get the current value of a clock.  Stub version.
-   Copyright (C) 1999-2020 Free Software Foundation, Inc.
+   Copyright (C) 1999-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/clock_nanosleep.c b/time/clock_nanosleep.c
index d5600ae105..7ecb1cfcb8 100644
--- a/time/clock_nanosleep.c
+++ b/time/clock_nanosleep.c
@@ -1,5 +1,5 @@
 /* High-resolution sleep with the specified clock.  Stub version.
-   Copyright (C) 2000-2020 Free Software Foundation, Inc.
+   Copyright (C) 2000-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/clock_settime.c b/time/clock_settime.c
index 11cfb61d06..7676aaeb23 100644
--- a/time/clock_settime.c
+++ b/time/clock_settime.c
@@ -1,5 +1,5 @@
 /* Set a clock to a given value.  Stub version.
-   Copyright (C) 1999-2020 Free Software Foundation, Inc.
+   Copyright (C) 1999-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/ctime.c b/time/ctime.c
index f92284823a..3810e03579 100644
--- a/time/ctime.c
+++ b/time/ctime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/ctime_r.c b/time/ctime_r.c
index 2f0e88b687..a69c3d61d8 100644
--- a/time/ctime_r.c
+++ b/time/ctime_r.c
@@ -1,5 +1,5 @@
 /* Return in BUF representation of time T in form of asctime
-   Copyright (C) 1996-2020 Free Software Foundation, Inc.
+   Copyright (C) 1996-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
diff --git a/time/difftime.c b/time/difftime.c
index f86a027055..c7c2b691fe 100644
--- a/time/difftime.c
+++ b/time/difftime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/dysize.c b/time/dysize.c
index 6942d699c0..31f08df812 100644
--- a/time/dysize.c
+++ b/time/dysize.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1994-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1994-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/era.c b/time/era.c
index aab8befff1..bbdc26fcaf 100644
--- a/time/era.c
+++ b/time/era.c
@@ -1,5 +1,5 @@
 /* Helper functions used by strftime/strptime to handle locale-specific "eras".
-   Copyright (C) 1995-2020 Free Software Foundation, Inc.
+   Copyright (C) 1995-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/ftime.c b/time/ftime.c
index 93f485bbf7..73406e471a 100644
--- a/time/ftime.c
+++ b/time/ftime.c
@@ -1,5 +1,5 @@
 /* Deprecated return date and time.
-   Copyright (C) 1994-2020 Free Software Foundation, Inc.
+   Copyright (C) 1994-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/getdate.c b/time/getdate.c
index ddd97ba277..6e2f75566b 100644
--- a/time/getdate.c
+++ b/time/getdate.c
@@ -1,5 +1,5 @@
 /* Convert a string representation of time to a time value.
-   Copyright (C) 1997-2020 Free Software Foundation, Inc.
+   Copyright (C) 1997-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
 
diff --git a/time/getitimer.c b/time/getitimer.c
index 019e04e734..0fbbed88ab 100644
--- a/time/getitimer.c
+++ b/time/getitimer.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/gettimeofday.c b/time/gettimeofday.c
index e4671edd13..18c84f68c7 100644
--- a/time/gettimeofday.c
+++ b/time/gettimeofday.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/gmtime.c b/time/gmtime.c
index 3c04a00970..038898b9ff 100644
--- a/time/gmtime.c
+++ b/time/gmtime.c
@@ -1,5 +1,5 @@
 /* Convert `time_t' to `struct tm' in UTC.
-   Copyright (C) 1991-2020 Free Software Foundation, Inc.
+   Copyright (C) 1991-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/lc-time-cleanup.c b/time/lc-time-cleanup.c
index e8d2d856c3..597c01644e 100644
--- a/time/lc-time-cleanup.c
+++ b/time/lc-time-cleanup.c
@@ -1,5 +1,5 @@
 /* Cleanup code for data structures kept by strftime/strptime helper functions.
-   Copyright (C) 2002-2020 Free Software Foundation, Inc.
+   Copyright (C) 2002-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/time/localtime.c b/time/localtime.c
index 2cee721be8..327c8381da 100644
--- a/time/localtime.c
+++ b/time/localtime.c
@@ -1,5 +1,5 @@
 /* Convert `time_t' to `struct tm' in local time zone.
-   Copyright (C) 1991-2020 Free Software Foundation, Inc.
+   Copyright (C) 1991-2021 Free Softwar