Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index c893594d0c33139efbc8d75e43eaed487116b58b..6047713aff39dc8a9f94952ecf3b136223605eec 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit c893594d0c33139efbc8d75e43eaed487116b58b
+Subproject commit 6047713aff39dc8a9f94952ecf3b136223605eec