S390: Get rid of make warning: overriding recipe for target gconv-modules.

This patch introduces a way to provide an architecture dependent gconv-modules
file. Before this patch, the gconv-modules file was normally installed from
src-dir/iconvdata/gconv-modules. The S390 Makefile had overridden the
installation recipe (with a make warning) in order to install the
gconv-module-s390 file from build-dir.
The iconvdata/Makefile provides another recipe, which copies the gconv-modules
file from src to build dir, which are used by the testcases.
Thus the testcases does not use the currently build s390-modules.

This patch uses build-dir/iconvdata/gconv-modules for installation, which
is generated by concatenating src-dir/iconvdata/gconv-modules and the
architecture specific one. The latter one can be specified by setting the variable
sysdeps-gconv-modules in sysdeps/.../Makefile.

The architecture specific gconv-modules file is emitted before the common one
because these modules aren't used in all possible conversions. E.g. the converting
from INTERNAL to UTF-16 used the common UTF-16.so module instead of UTF16_UTF32_Z9.so.

This way, the s390-Makefile does not need to override the recipe for gconv-modules
and no warning is emitted anymore.
Since we no longer support empty objpfx the conditional test in iconvdata/Makefile
is removed.

ChangeLog:

	* iconvdata/Makefile ($(inst_gconvdir)/gconv-modules):
	Install file from $(objpfx)gconv-modules.
	($(objpfx)gconv-modules): Concatenate architecture specific file
	in variable sysdeps-gconv-modules and gconv-modules in src dir.
	* sysdeps/s390/gconv-modules: New file.
	* sysdeps/s390/s390-64/Makefile: ($(inst_gconvdir)/gconv-modules):
	Deleted.
	($(objpfx)gconv-modules-s390): Deleted.
	(sysdeps-gconv-modules): New variable.

1 files changed, 50 insertions, 0 deletions

diff --git a/sysdeps/s390/gconv-modules b/sysdeps/s390/gconv-modules
new file mode 100644
index 0000000000..70211057b3
--- /dev/null
+++ b/sysdeps/s390/gconv-modules
@@ -0,0 +1,50 @@
+# GNU libc iconv configuration.
+# Copyright (C) 1997-2016 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
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+# All lines contain the following information:
+
+# If the lines start with `module'
+#  fromset:	either a name triple or a regular expression triple.
+#  toset:	a name triple or an expression with \N to get regular
+#		expression matching results.
+#  filename:	filename of the module implementing the transformation.
+#		If it is not absolute the path is made absolute by prepending
+#		the directory the configuration file is found in.
+#  cost:	optional cost of the transformation.  Default is 1.
+
+# If the lines start with `alias'
+#  alias:	alias name which is not really recognized.
+#  name:	the real name of the character set
+
+# S/390 hardware accelerated modules
+#	from			to			module			cost
+module	ISO-8859-1//		IBM037//		ISO-8859-1_CP037_Z900	1
+module	IBM037//		ISO-8859-1//		ISO-8859-1_CP037_Z900	1
+module	ISO-10646/UTF8/		UTF-32//		UTF8_UTF32_Z9		1
+module	UTF-32BE//		ISO-10646/UTF8/		UTF8_UTF32_Z9		1
+module	ISO-10646/UTF8/		UTF-32BE//		UTF8_UTF32_Z9		1
+module	UTF-16BE//		UTF-32//		UTF16_UTF32_Z9		1
+module	UTF-32BE//		UTF-16//		UTF16_UTF32_Z9		1
+module	INTERNAL		UTF-16//		UTF16_UTF32_Z9		1
+module	UTF-32BE//		UTF-16BE//		UTF16_UTF32_Z9		1
+module	INTERNAL		UTF-16BE//		UTF16_UTF32_Z9		1
+module	UTF-16BE//		UTF-32BE//		UTF16_UTF32_Z9		1
+module	UTF-16BE//		INTERNAL		UTF16_UTF32_Z9		1
+module	UTF-16BE//		ISO-10646/UTF8/		UTF8_UTF16_Z9		1
+module	ISO-10646/UTF8/		UTF-16//		UTF8_UTF16_Z9		1
+module	ISO-10646/UTF8/		UTF-16BE//		UTF8_UTF16_Z9		1