Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index 427249c61666dcf649e6ba18fb327cdf71c45780..949989513e631b61196f11fd8d647d4dc77d7f40 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 427249c61666dcf649e6ba18fb327cdf71c45780
+Subproject commit 949989513e631b61196f11fd8d647d4dc77d7f40