Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index 47548a77525a0f4489c9c420ccc2159079365da8..08600051ea1ce2d908257e7ba34b25ba9ff379cc 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 47548a77525a0f4489c9c420ccc2159079365da8
+Subproject commit 08600051ea1ce2d908257e7ba34b25ba9ff379cc