Update to newer gnulib.

diff --git a/gnulib b/gnulib
index 4d38340a76dbee56036a5fcc0f052ebcff616a59..0346e2edf270eeef64bc537136b20ff07f3ecf27 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 4d38340a76dbee56036a5fcc0f052ebcff616a59
+Subproject commit 0346e2edf270eeef64bc537136b20ff07f3ecf27