Update to newest gnulib.

diff --git a/gnulib b/gnulib
index 7daa86fea49d9928dcf2c57747ee63e9541287ed..5e50baa16ef90204d9048a9e2f23c5a538955121 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 7daa86fea49d9928dcf2c57747ee63e9541287ed
+Subproject commit 5e50baa16ef90204d9048a9e2f23c5a538955121