build: update from gnulib

* gnulib: Update submodule to latest.

diff --git a/gnulib b/gnulib
index 2f5181b1a247323cb2a4a4c6165997674866bb20..077d9afeabe70728bec79f7ea9eff0264a7fccdc 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 2f5181b1a247323cb2a4a4c6165997674866bb20
+Subproject commit 077d9afeabe70728bec79f7ea9eff0264a7fccdc