build: update from gnulib

* gnulib: Update submodule to latest.

diff --git a/gnulib b/gnulib
index 61893df315d491846a8b33af7558bf3cca5410dd..facd2482db60c9e08f60ecd6f004940393e1630a 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 61893df315d491846a8b33af7558bf3cca5410dd
+Subproject commit facd2482db60c9e08f60ecd6f004940393e1630a