maint: update to latest gnulib

Another update is required to pick up today's gnulib fix for mingw
builds (now that gnulib turns on mingw's replacement printf that
understands %lld, it must also tell the compiler to respect the
improved definition of PRIdMAX and friends).

* .gnulib: Update to latest.

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

diff --git a/.gnulib b/.gnulib
index 498a1b6bc7d70f944ca0f939e1bc470889fdce76..c27f1a356f2f321daa7f971ef276a1dbfa873bf8 160000 (submodule)
--- a/.gnulib
+++ b/.gnulib
@@ -1 +1 @@
-Subproject commit 498a1b6bc7d70f944ca0f939e1bc470889fdce76
+Subproject commit c27f1a356f2f321daa7f971ef276a1dbfa873bf8