gnulib: Update submodule to recent commit

diff --git a/gnulib b/gnulib
index d3efdd55f36a01118ed936da25633858a5757897..30417e7f918e95c368ef56a650fa5b5fa45cb130 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit d3efdd55f36a01118ed936da25633858a5757897
+Subproject commit 30417e7f918e95c368ef56a650fa5b5fa45cb130