gnulib: Update submodule

diff --git a/gnulib b/gnulib
index e93789db7e86c51d6cb9683ea508e676a55cdefa..6466c4b5321eb2625a25e582516c0fa4a5261d05 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit e93789db7e86c51d6cb9683ea508e676a55cdefa
+Subproject commit 6466c4b5321eb2625a25e582516c0fa4a5261d05