build: update gnulib submodule to latest

diff --git a/gnulib b/gnulib
index d57daa5979535178a57789403506270b6311cc85..8f292d0931b1e1f7c5a063bd400ff9dabb3897ff 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit d57daa5979535178a57789403506270b6311cc85
+Subproject commit 8f292d0931b1e1f7c5a063bd400ff9dabb3897ff