Update gnulib.

diff --git a/gnulib b/gnulib
index b287b621969d5a3f56058ff01e554839814da4e1..d6176702c3ffb6c56e6620397470e1b3bd540b10 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit b287b621969d5a3f56058ff01e554839814da4e1
+Subproject commit d6176702c3ffb6c56e6620397470e1b3bd540b10