build: update gnulib submodule to latest

diff --git a/gnulib b/gnulib
index 8f292d0931b1e1f7c5a063bd400ff9dabb3897ff..8fa1fba5dab1a126c25e534867f653359039d177 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 8f292d0931b1e1f7c5a063bd400ff9dabb3897ff
+Subproject commit 8fa1fba5dab1a126c25e534867f653359039d177