Update to newest gnulib.

diff --git a/gnulib b/gnulib
index 3f53c355dd2efa18317f53d24c8b19b8a278674f..7daa86fea49d9928dcf2c57747ee63e9541287ed 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 3f53c355dd2efa18317f53d24c8b19b8a278674f
+Subproject commit 7daa86fea49d9928dcf2c57747ee63e9541287ed