build: update gnulib submodule to latest

diff --git a/gnulib b/gnulib
index 9aca7b67333fd0a90bf56104325ce96199644451..dd0af10fa597a95ffe5f4f110ef5edefc2f680bc 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 9aca7b67333fd0a90bf56104325ce96199644451
+Subproject commit dd0af10fa597a95ffe5f4f110ef5edefc2f680bc