ld message translation for emultempl and emulparams

ld message translation for emultempl and emulparams

Most of the emultempl/*.em error/warning messages do not currently
appear in ld.pot, and fixing that is not simply a matter of adding
missing files to POTFILES.  The difficulty is the shell-script
quoting, for example aarch64elf.em:PARSE_AND_LIST_OPTIONS "Don'\''t".
I suppose you could avoid contractions like "don't" but I'm unsure as
to whether gettext could handle everything in the emulparams scripts.

The right thing to do is feed the generated C files to gettext, as
this patch does.  The patch just copies what is already done in bfd/
for generated files.

	* Makefile.am (EMULATION_FILES, POTFILES): Delete.
	(SRC_POTFILES, BLD_POTFILES): Define.
	(po/POTFILES.in): Delete rule.
	(po/SRC-POTFILES.in, po/BLD-POTFILES.in): New rules.
	* configure.ac: Add AC_CONFIG_COMMANDS to create po/Makefile.
	* po/Make-in (DISTFILES): Remove POTFILES.in, add SRC-POTFILES.in
	and BLD-POTFILES.in.
	(POTFILES): Delete.
	(SRC-POTFILES, BLD-POTFILES): Define place marker.
	(ld.pot): Build from SRC-POTFILES plus BLD-POTFILES.
	(distclean, maintainer-clean): Tidy up new files.
	(POTFILES, POTFILES.in): Delete rules.
	(SRC-POTFILES, BLD-POTFILES, SRC-POTFILES.in, BLD-POTFILES.in):
	New rules.
	(Makefile): Depend on SRC-POTFILES and BLD-POTFILES.
	* po/SRC-POTFILES.in: Rename from po/POTFILES.in.
	* po/BLD-POTFILES.in: New file.
	* Makefile.in: Regenerate.
	* configure: Regenerate.