build: update gnulib submodule to latest

diff --git a/gnulib b/gnulib
index 32c16c45d7378b014d9aac6130104c4d02a9acdb..bb3fd10e6309f017618a12b2c10d3bfb813bfc08 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 32c16c45d7378b014d9aac6130104c4d02a9acdb
+Subproject commit bb3fd10e6309f017618a12b2c10d3bfb813bfc08