* lib/utime.in.h: Include <time.h>.
(_gl_utimens_windows): New declaration.
* lib/utime.c (_gl_utimens_windows): New function, based on utime.
(utime): Invoke it.
* lib/utimens.c (fdutimens): On native Windows, call _gl_utimens_windows
instead of utime.
* modules/utime (Depends-on): Add 'time'.

* lib/utime.in.h: Add comment for snippets.
(utime): New declaration.
* lib/utime.c: New file.
* m4/utime.m4: New file.
* m4/utime_h.m4 (gl_UTIME_H): Test for utime declaration.
(gl_UTIME_H_DEFAULTS): Initialize GNULIB_UTIME, HAVE_UTIME,
REPLACE_UTIME.
* modules/utime-h (Depends-on): Add snippets.
(Makefile.am): Substitute GNULIB_UTIME, HAVE_UTIME, REPLACE_UTIME.
Insert snippets.
* modules/utime: New file.
* doc/posix-functions/utime.texi: Mention the new module.

This module, like autoconf's AC_FUNC_UTIME_NULL macro, has been
unnecessary for years, and has been marked as obsolete for 10 months.
* modules/utime: Remove file.
* lib/utime.c: Remove file.
* m4/utime.m4: Remove file.
* m4/utimes-null.m4: Remove file.
* doc/posix-functions/utime.texi (utime): Remove reference to
the module.  Move the sole "fixed by gnulib" item into the
"problems not fixed by Gnulib" list.
* MODULES.html.sh (func_all_modules): Remove reference to "utime".

This provides slightly increased consistency when opening-for-write
the name of a non-directory spelled with a trailing slash.
* modules/chdir-safer: Likewise.
* modules/chown: Likewise.
* modules/clean-temp: Likewise.
* modules/copy-file: Likewise.
* modules/fchdir: Likewise.
* modules/fcntl-safer: Likewise.
* modules/pipe: Likewise.
* modules/utime: Likewise.
Prompted by Eric Blake and Bruno Haible.