Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index dd6b42088bd08c9fdf53ed539c7f50d5009874c1..08600051ea1ce2d908257e7ba34b25ba9ff379cc 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit dd6b42088bd08c9fdf53ed539c7f50d5009874c1
+Subproject commit 08600051ea1ce2d908257e7ba34b25ba9ff379cc