Update gnulib

diff --git a/gnulib b/gnulib
index d6176702c3ffb6c56e6620397470e1b3bd540b10..a6aa0b6f74864a94e940b310f6200e18f7d9dcc9 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit d6176702c3ffb6c56e6620397470e1b3bd540b10
+Subproject commit a6aa0b6f74864a94e940b310f6200e18f7d9dcc9