refresh libusual

diff --git a/lib b/lib
index fb3eccb7c1fa3348f2befa018cc5098a424d0769..30d46077a8d142eef03b9f26cb2d365e0c8df17d 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit fb3eccb7c1fa3348f2befa018cc5098a424d0769
+Subproject commit 30d46077a8d142eef03b9f26cb2d365e0c8df17d