Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index ac19d2a1ff86dfb70bec3fd1dc6e2fa10b35439e..e16e872076736447fe5e1bbb6bbb73d982efbe63 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit ac19d2a1ff86dfb70bec3fd1dc6e2fa10b35439e
+Subproject commit e16e872076736447fe5e1bbb6bbb73d982efbe63