Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index 3691a095c1eb6579d32551b2af02550bc3f6cccc..9496497d039ec21a29ad65c66d5d41b03c4098d6 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 3691a095c1eb6579d32551b2af02550bc3f6cccc
+Subproject commit 9496497d039ec21a29ad65c66d5d41b03c4098d6