Update libusual

diff --git a/lib b/lib
index fe4dd0255ea796e64599c0fc28e6900fbc07e6aa..0bf97ffcba6b7ee76458d1fef520ef333d738433 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit fe4dd0255ea796e64599c0fc28e6900fbc07e6aa
+Subproject commit 0bf97ffcba6b7ee76458d1fef520ef333d738433