build: *really* update to a usable gnulib commit

diff --git a/gnulib b/gnulib
index bc38a4c491577399f8fae0a8138e5437249d50b3..82e60ea16931aa9a02346900bd90fe904341bf62 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit bc38a4c491577399f8fae0a8138e5437249d50b3
+Subproject commit 82e60ea16931aa9a02346900bd90fe904341bf62