(libintl.h): Include this if _LIBC. Otherwise include gettext.h.
(wchar.h): Include, maybe.
(attribute_hidden): Define if not defind.
(__getopt_initialized): Use attribute_hidden.
(__libc_argc, __libc_argv): Renamed from original_argc, etc.
(__getopt_nonoption_flags, nonoption_flags_max_len, nonoption_flags_len):
Conditional on USE_NONOPTION_FLAGS.
(SWAP_FLAGS): New definitions.
(exchange): Test USE_NONOPTION_FLAGS.
(_getopt_initialize): Test USE_NONOPTION_FLAGS.
(_getopt_internal): Error if argc < 1. New local var print_errors.
Improve test for ambiguous long option.
Add LIBIO support for error message output.
(NONOPTION_P): Test USE_NONOPTION_FLAGS.
* b2m.c, emacsclient.c, emacsserver.c, fakemail.c, make-docfile.c,
movemail.c, pop.c:
Do not include <stdlib.h>, as <config.h> does this now.
* b2m.c, emacsserver.c, etags.c, profile.c:
Include <config.h> before any system include files.
* emacsclient.c, emacsserver.c, fakemail.c, movemail.c, pop.c,
test-distrib.c:
(read, write, open, close): Do not undef.
* getopt.c, getopt1.c: Adopt glibc 2.1.2, with the following fix:
(const): Do not define if HAVE_CONFIG_H; that's config.h's job.
* getopt.h: Adopt glibc 2.1.2.
