Update to the newest gnulib.

diff --git a/gnulib b/gnulib
index efa78d8905e1a0260930692fd888d1917a837cd6..e979e268f05361154186a64d9814d457098c4fd8 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit efa78d8905e1a0260930692fd888d1917a837cd6
+Subproject commit e979e268f05361154186a64d9814d457098c4fd8