Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index 949989513e631b61196f11fd8d647d4dc77d7f40..7c908caf99f302f3d5adec377c01f032328a7e6b 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 949989513e631b61196f11fd8d647d4dc77d7f40
+Subproject commit 7c908caf99f302f3d5adec377c01f032328a7e6b