build: update from gnulib

* gnulib: Update submodule to latest.

diff --git a/gnulib b/gnulib
index 61893df..ea5142f 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 61893df315d491846a8b33af7558bf3cca5410dd
+Subproject commit ea5142f7369225f5aef66f89f9b9d1421c6dceff