Update to newest gnulib.

diff --git a/gnulib b/gnulib
index 2e3f0c910896a52ce0944bd04d4da3413682cf1f..cf9faba87af1487f8e8920947a8e45d45e2512d5 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 2e3f0c910896a52ce0944bd04d4da3413682cf1f
+Subproject commit cf9faba87af1487f8e8920947a8e45d45e2512d5