Update to newest gnulib.

diff --git a/gnulib b/gnulib
index 160d5e7d9a64a29a52d4821fd0ef2136d7e2102a..342e7423fd65e96f83299494d69ddf03e171413e 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 160d5e7d9a64a29a52d4821fd0ef2136d7e2102a
+Subproject commit 342e7423fd65e96f83299494d69ddf03e171413e