Update Gnulib

diff --git a/gnulib b/gnulib
index 71be4c87c8267369f40fbfab7523ab9847154c02..b2f9ff7b19fedfe58144693c999b9a0c067cc131 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 71be4c87c8267369f40fbfab7523ab9847154c02
+Subproject commit b2f9ff7b19fedfe58144693c999b9a0c067cc131