build: update gnulib to latest

diff --git a/gnulib b/gnulib
index 1039a5f2cee3cda1c11f64a5eb3a15b2e87cd2f0..001a31578623e5bffceb5845cddaad46a9c9505d 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 1039a5f2cee3cda1c11f64a5eb3a15b2e87cd2f0
+Subproject commit 001a31578623e5bffceb5845cddaad46a9c9505d