conform: Add initial support for C23.

Hi Joseph,

As we discussed, this patch just makes C23 include every check that is
performed by C11.

I tested the commit by adding the ISO23 Make and Python variables to be
the same as ISO11.  So the only difference was compiling with -DISO23
instead of -DISO11.  And changed the temporary directories to instead
use the format f'/tmp/glibc-{self.standard}-{self.header}'.  Then I used
a shell script to run 'cmp' on each file in the ISO11 and ISO23
directories for each header to make sure they were the same.

-- 8< --

Make C23 checks include every test that is performed by C11.  Done by
running the following command:

find conform -name '*.h-data' | xargs sed -i \
  -e 's| !defined ISO11| !defined ISO11 \&\& !defined ISO23|g' \
  -e 's| defined ISO11| defined ISO11 \|\| defined ISO23|g' \
  -e 's|ifdef ISO11|if defined ISO11 \|\| defined ISO23|g' \
  -e 's|ifndef ISO11|if !defined ISO11 \&\& !defined ISO23|g'

Signed-off-by: Collin Funk <collin.funk1@gmail.com>

82 files changed, 151 insertions, 151 deletions

diff --git a/conform/data/aio.h-data b/conform/data/aio.h-data
index adb291b6e1..7801faa0c6 100644
--- a/conform/data/aio.h-data
+++ b/conform/data/aio.h-data
@@ -1,4 +1,4 @@
-#if !defined ISO && !defined ISO99 && !defined ISO11 && !defined XPG4 && !defined XPG42
+#if !defined ISO && !defined ISO99 && !defined ISO11 && !defined ISO23 && !defined XPG4 && !defined XPG42
 type {struct aiocb}
 
 // Test elements of the AIO control struct.
diff --git a/conform/data/arpa/inet.h-data b/conform/data/arpa/inet.h-data
index 040b8212c7..c514690141 100644
--- a/conform/data/arpa/inet.h-data
+++ b/conform/data/arpa/inet.h-data
@@ -1,4 +1,4 @@
-#if !defined ISO && !defined ISO99 && !defined ISO11 && !defined POSIX && !defined XPG4
+#if !defined ISO && !defined ISO99 && !defined ISO11 && !defined ISO23 && !defined POSIX && !defined XPG4
 // in_port_t should have exactly 16 bits
 type in_port_t
 // in_addr_t should have exactly 32 bits
diff --git a/conform/data/assert.h-data b/conform/data/assert.h-data
index acdfef99e1..2344ee3237 100644
--- a/conform/data/assert.h-data
+++ b/conform/data/assert.h-data
@@ -1,9 +1,9 @@
 macro assert
 
-#ifdef ISO11
+#if defined ISO11 || defined ISO23
 macro static_assert
 #endif
 
-#if !defined ISO && !defined ISO99 && !defined ISO11
+#if !defined ISO && !defined ISO99 && !defined ISO11 && !defined ISO23
 allow *_t
 #endif
diff --git a/conform/data/complex.h-data b/conform/data/complex.h-data
index 4af7757bd7..0c267e47a3 100644
--- a/conform/data/complex.h-data
+++ b/conform/data/complex.h-data
@@ -74,7 +74,7 @@ function {long double complex} csqrtl (long double complex)
 function {long double complex} ctanhl (long double complex)
 function {long double complex} ctanl (long double complex)
 
-# if defined ISO11
+# if defined ISO11 || defined ISO23
 macro-function {double complex} CMPLX (double, double)
 macro-function {float complex} CMPLXF (float, float)
 macro-function {long double complex} CMPLXL (long double, long double)
diff --git a/conform/data/cpio.h-data b/conform/data/cpio.h-data
index ac7d40fd5e..ab91f2c07f 100644
--- a/conform/data/cpio.h-data
+++ b/conform/data/cpio.h-data
@@ -1,4 +1,4 @@
-#if !defined ISO && !defined ISO99 && !defined ISO11 && !defined POSIX
+#if !defined ISO && !defined ISO99 && !defined ISO11 && !defined ISO23 && !defined POSIX
 constant C_IRUSR == 0000400
 constant C_IWUSR == 0000200
 constant C_IXUSR == 0000100
diff --git a/conform/data/ctype.h-data b/conform/data/ctype.h-data
index 7e10794e46..84426f99fa 100644
--- a/conform/data/ctype.h-data
+++ b/con