Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index cbc02d24a5e064f4699939cbb15cce1a448d444a..3ca749369a314f5fe1e13beb7b6ae068403eee52 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit cbc02d24a5e064f4699939cbb15cce1a448d444a
+Subproject commit 3ca749369a314f5fe1e13beb7b6ae068403eee52