Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index 981d04f93ea75c85609c18a6dcdb13cce8f07e05..7a38f30f925db7d486460c18df41413f3c7ef74b 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 981d04f93ea75c85609c18a6dcdb13cce8f07e05
+Subproject commit 7a38f30f925db7d486460c18df41413f3c7ef74b