Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index f4ba7b1bcfc8ee0af0a0d0929ee23451adccbeeb..66d32ceddd565abff57901c59014023a9426cc8a 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit f4ba7b1bcfc8ee0af0a0d0929ee23451adccbeeb
+Subproject commit 66d32ceddd565abff57901c59014023a9426cc8a