build: update gnulib submodule to latest

diff --git a/gnulib b/gnulib
index 81d0a26465c44b2041fcf9a6ec08a0cd43776825..92bbc1b583743b7e463cdfbcd048d9d52063b8c4 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 81d0a26465c44b2041fcf9a6ec08a0cd43776825
+Subproject commit 92bbc1b583743b7e463cdfbcd048d9d52063b8c4