maint: update gnulib submodule

Gnulib recently patched gcc warning detection so that it does
not treat things like -Wno-unused-command-line-argument as
supported in gcc (treating it as supported merely resulted in
extra verbosity when an actual compile error occurred).  It
has also improved bootstrap to work with less hassle on OpenBSD.

* .gnulib: Update to latest, in part for bootstrap and warnings
improvements.
* bootstrap: Resync from gnulib.

Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 0 insertions, 0 deletions

diff --git a/.gnulib b/.gnulib
-Subproject 644c40496cf7d5a705a73c9dd32b035fcecc2ab
+Subproject 0ba087759d2797c8f7d3c34bef6268ba3fd212c