Update after gnulib changed.

Update after gnulib changed.

* gnulib-local/lib/getopt-core.h.diff: New file.
* gnulib-local/lib/getopt.in.h.diff: Remove file.
* gnulib-local/lib/unistd.in.h.diff: Update.
* gnulib-local/modules/fnmatch.diff: Update.
* gnulib-local/Makefile.am (EXTRA_DIST): Add lib/getopt-core.h.diff. Remove
lib/getopt.in.h.diff.
* gettext-runtime/m4/wint_t.m4: Update from gnulib.
* autogen.sh: In the gnulib-tool invocations, avoid gnulib test modules that
depend on 'hash' (because we use a different 'hash' module).
* .gitignore: Update.