gnulib: update

diff --git a/gnulib b/gnulib
index 0dbbe3f55352241d290403577dfebed802d6fd9a..daf7f8c02242c535d596231e2f655109b97fa2bc 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 0dbbe3f55352241d290403577dfebed802d6fd9a
+Subproject commit daf7f8c02242c535d596231e2f655109b97fa2bc