gnulib: sync with upstream.

Notably this moves to the new 64bit obstack implementation.
* gnulib: Sync with upstream, for maint.mk bug fixes et al.
* build-aux/m4/gnulib-cache.m4, po/Makevars: Regenerate.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
3 files changed