build: update gnulib submodule to latest

diff --git a/gnulib b/gnulib
index c408d9a53dbdaf48b555f216e250a2b3b8e48113..0e7af0cff0011f25f5f842af5216325923017b34 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit c408d9a53dbdaf48b555f216e250a2b3b8e48113
+Subproject commit 0e7af0cff0011f25f5f842af5216325923017b34