build: update gnulib submodule to latest

diff --git a/gnulib b/gnulib
index 0bca572030d26721cb81800ff4264b6f18dc7e40..44cec52a5ff4e57658c717d57d61693587b6e299 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 0bca572030d26721cb81800ff4264b6f18dc7e40
+Subproject commit 44cec52a5ff4e57658c717d57d61693587b6e299