Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index dd801be6c84325d140c67ec9869b3844bc5550ac..b00a9678886a17c60355454e59c71d32b9b8f789 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit dd801be6c84325d140c67ec9869b3844bc5550ac
+Subproject commit b00a9678886a17c60355454e59c71d32b9b8f789