Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index 949989513e631b61196f11fd8d647d4dc77d7f40..e9c1d94f58eaacee919bb2015da490b980a5eedf 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 949989513e631b61196f11fd8d647d4dc77d7f40
+Subproject commit e9c1d94f58eaacee919bb2015da490b980a5eedf