Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index 7e5312beab91ecc96211cdc3e5960af6908a2ed2..6fd6098f510255c0b9134088b1526a50fef90edd 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 7e5312beab91ecc96211cdc3e5960af6908a2ed2
+Subproject commit 6fd6098f510255c0b9134088b1526a50fef90edd