Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index 701d20aaf579bb71f35209dd63a272c3d9d21096..f703b5434b1eb02c483f631fe23368130ebc3e07 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 701d20aaf579bb71f35209dd63a272c3d9d21096
+Subproject commit f703b5434b1eb02c483f631fe23368130ebc3e07