Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index f3967bd90989306a8802f00d0b1aa1811f0c1b96..43e98da7c9408267c0bf54dd7eebb710883b8d8d 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit f3967bd90989306a8802f00d0b1aa1811f0c1b96
+Subproject commit 43e98da7c9408267c0bf54dd7eebb710883b8d8d