gnulib: update to latest

diff --git a/gnulib b/gnulib
index 271dfe37985ff3a6e9cf9d08ab67e8ea3e239162..f58b1739712d0c2c6ad86a735c136bac4a0a16f5 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 271dfe37985ff3a6e9cf9d08ab67e8ea3e239162
+Subproject commit f58b1739712d0c2c6ad86a735c136bac4a0a16f5