Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index 08600051ea1ce2d908257e7ba34b25ba9ff379cc..2c83b72122d32c0583cd4ab3b2c98aa61f69f034 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 08600051ea1ce2d908257e7ba34b25ba9ff379cc
+Subproject commit 2c83b72122d32c0583cd4ab3b2c98aa61f69f034