gnulib: Update submodule

diff --git a/gnulib b/gnulib
index 6466c4b5321eb2625a25e582516c0fa4a5261d05..722f67e9716bf914c18d468336c1f4f9e5cce915 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 6466c4b5321eb2625a25e582516c0fa4a5261d05
+Subproject commit 722f67e9716bf914c18d468336c1f4f9e5cce915