Update to newest gnulib.

diff --git a/gnulib b/gnulib
index 30f4fdcb53f803cb8308d34f3a51320812035c48..17c967e57bf89d4c6fc0e94453814cf6852e39e2 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 30f4fdcb53f803cb8308d34f3a51320812035c48
+Subproject commit 17c967e57bf89d4c6fc0e94453814cf6852e39e2