specific makefiles to support getopt_.h generation with MSVC.

* nt/gmake.defs (PRAGMA_SYSTEM_HEADER): Add for GCC.

* nt/nmake.defs (PRAGMA_SYSTEM_HEADER): Add, but ignore with MSVC.

Bug reported by Chong Yidong for SunOS 5.10 Generic_127111-11 sparc.
I cannot reproduce it on SunOS 5.10 Generic_141444-09 sparc but
possibly this is because Sun fixed the 'stat' bug in my version.
* Makefile.in (GNULIB_TOOL_FLAGS): Do not avoid the pathmax module.
* lib/pathmax.h, m4/pathmax.m4: New files, from gnulib.
* lib/gnulib.mk, m4/gl-comp.m4: Regenerate.
These changes are based on gnulib version
4f11d6bebc3098c64ffde27079ab0d0cecfd0cdc dated 2011-10-07 20:59:10,
because Emacs is in feature freeze and we do not want to merge any
more-recent changes from gnulib.

 lib/makefile.w32-in ($(BLD)/sha1.$(O) $(BLD)/sha256.$(O)
 $(BLD)/sha512.$(O)): Depend on stamp_BLD.  Fixes a build failure
 with "make -j3".

Small portions of the changes by Fabrice Popineau <fabrice.popineau@supelec.fr>.

 src/makefile.w32-in (TAGS-gmake): Don't use $(patsubst ...), as
 Nmake barfs on that.  Use $(OBJ*_c) variables instead, defined on
 nt/gmake.defs.
 src/lisp.h (ENUM_BF): New macro, for enumerated types in bitfields,
 which are not supported by MSVC.
 (Lisp_Symbol, Lisp_Misc_Any, Lisp_Marker, Lisp_Misc_Overlay)
 (Lisp_Save_Value, Lisp_Free): Use ENUM_BF for enumerated types in
 bitfields.
 (Lisp_Object) [USE_LISP_UNION_TYPE]: Use ENUM_BF for enumerated
 types in bitfields.
 (DEFUN) [_MSC_VER]: Define in a different way for MSVC.
 src/w32fns.c [_MSC_VER]: DECLARE_HANDLE for any MSVC version.
 src/w32.c: Don't include w32api.h for MSVC.
 (init_environment) [_MSC_VER]: Call sys_access, not _access.
 src/s/ms-w32.h <sigset_t, ssize_t> [_MSC_VER]: Typedefs for MSVC.
 [_MSC_VER]: Include sys/timeb.h, sys/stat.h, and signal.h.
 (fstat, stat, utime) [_MSC_VER]: Redirect to their sys_* cousins.
 (malloc, free, realloc, calloc) [_MSC_VER]: Always redirect to the
 e_* cousins.
 (alloca) [_MSC_VER]: Define to _alloca.
 src/lisp.h (DECL_ALIGN) [_MSC_VER]: Define for MSVC.
 src/regex.c <re_char> [_MSC_VER]: A separate definition for MSVC.
 nt/makefile.w32-in (clean-other-dirs-nmake)
 (distclean-other-dirs-nmake, maintainer-clean-other-dirs-nmake):
 Update for current structure of doc/ subdirectories.
 nt/gmake.defs (OBJ0_c, OBJ1_c, OBJ2_c): New variables.
 nt/INSTALL: Update for newer versions of MSVC.
 lib/makefile.w32-in (FRC): New dummy target.
 (TAGS): Depend on FRC.

Fixes: debbugs:9960

* lib/signal.in.h, lib/sigprocmask.c, m4/gl-comp.m4:
* m4/gnulib-common.m4: Merge from gnulib.
Without this, 'configure' would say "func_gl_gnulib_m4code_pathmax:
command not found" on powerpc-apple-darwin9.8.0.

This clarifies and fixes some licensing issues raised by Glenn Morris
<http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00397.html>.
It also merges the latest version of texinfo.tex and has some
MSVC-related changes that don't affect Emacs.
* Makefile.in (GNULIB_TOOL_FLAGS): Avoid msvc-inval, msvc-nothrow,
pathmax, and raise, since these are needed only to address
MSVC-related issues that Emacs doesn't have.
* doc/misc/texinfo.tex, lib/dup2.c, lib/gnulib.mk, lib/signal.in.h:
* lib/sigprocmask.c, lib/stat.c, lib/stdio.in.h, lib/sys_stat.in.h:
* lib/unistd.in.h, m4/dup2.m4, m4/getloadavg.m4, m4/gl-comp.m4:
* m4/include_next.m4, m4/signal_h.m4, m4/signalblocking.m4:
* m4/stdint.m4, m4/stdio_h.m4, m4/sys_stat_h.m4, m4/time_h.m4:
* m4/unistd_h.m4: Merge from gnulib.

* lib/lstat.c, lib/stat.c, m4/include_next.m4, m4/nocrash.m4:
* m4/signal_h.m4, m4/time_h.m4, m4/unistd_h.m4:
Merge from gnulib.  This fixes a compilation error on Tru64 UNIX
aka OSF/1 5.1 DTK cc.  There is also some mingw stuff here that
doesn't affect Emacs.

* m4/largefile.m4: New file, so that Emacs does not mess up when
accessing files with large inode numbers in MacOS X 10.5 and later.
* m4/nocrash.m4: New file, to avoid triggering background debugger
and/or create core dumps during 'configure'.
* build-aux/move-if-change: Renamed from move-if-change.
* build-aux/snippet/arg-nonnull.h: Renamed from arg-nonnull.h.
* build-aux/snippet/c++defs.h: Renamed from c++defs.h.
* build-aux/snippet/warn-on-use.h: Renamed from warn-on-use.h.
* build-aux/snippet/_Noreturn.h: New file, for draft C1X _Noreturn.
* .bzrignore: The autogenerated files compile, config.guess,
config.sub, depcomp, install-sh, and missing are now in build-aux.
* Makefile.in (epaths-force, sync-from-gnulib):
move-if-change is now in build-aux.
(GNULIB_TOOL_FLAGS): Avoid threadlib; this is now a prerequisite
of gnulib's pthread_sigmask module, but Emacs doesn't need it.
(mkdir): install-sh is now in build-aux.
* config.bat: c++defs.h is now in build-aux/snippets.
* configure.in: Specify AC_CONFIG_AUX_DIR with build-aux (the
usual parameter).
* lib/gnulib.mk, m4/gl-comp.m4: Regenerate.
* lib/makefile.w32-in (ARG_NONNULL_H): arg-nonnull.h moved
to build-aux/snippet.
* lib/pthread_sigmask.c, lib/stdlib.in.h, m4/extensions.m4:
* m4/getopt.m4, m4/gnulib-common.m4, m4/pthread_sigmask.m4:
Merge from gnuilib.  This fixes porting bugs on Cygwin, Irix, and
Solaris, enables MacOS extensions, and enables nocrash during
'configure'.
* make-dist: Adjust to new build-aux and build-aux/snippit dirs.
* admin/notes/copyright: The files compile, config.guess, config.sub,
depcomp, install-sh, missing, and move-if-change are now in the
new build-aux subdirectory.  The files arg-nonnull.h, c++defs.h,
and warn-on-use.h are now in build-aux/snippets.  New file
build-aux/snippets/_Noreturn.h.
* leim/Makefile.in (install): install-sh is now in build-aux.
* lib-src/Makefile.in ($(DESTDIR)${archlibdir}): install-sh moved
to build-aux.
* msdos/sedlibmk.inp (CONFIG_CLEAN_VPATH_FILES): Adjust to snippet moves
from top level to build-aux/snippet.
* src/Makefile.in (gl-stamp): move-if-change is now in build-aux.