* c-decl.c : Mark strings for translation.
(parmlist_tags_warning): Use distinct messages instead
of conditional expressions.
* diagnostic.c (v_message_with_decl): Mark string for translation.
* gcc.c: Mark messages for translation.
(display_help): Combine messages into one string where necessary.
* mips-tfile.c: Add intl.h. Mark messages for translation.
* rtl.c (fatal_with_file_and_line): Modify function for NLS. Mark
messages for translation.
* timevar.c: Mark messages for translation.
* tlink.c: Likewise.
* toplev.c: Likewise.