Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index 66d32ceddd565abff57901c59014023a9426cc8a..701d20aaf579bb71f35209dd63a272c3d9d21096 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 66d32ceddd565abff57901c59014023a9426cc8a
+Subproject commit 701d20aaf579bb71f35209dd63a272c3d9d21096