Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index 9187f1c193767b7a09a2d9ef8e72f6f0dabd3250..962a577b7685e0aa938b8241460c12484ae725c3 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 9187f1c193767b7a09a2d9ef8e72f6f0dabd3250
+Subproject commit 962a577b7685e0aa938b8241460c12484ae725c3