Update libusual

diff --git a/lib b/lib
index 16249b5e76ceb04b46ed596e13001d9fee483e2f..cd5859fcc592becbc8a9d6da3d7fc49009c4d00c 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit 16249b5e76ceb04b46ed596e13001d9fee483e2f
+Subproject commit cd5859fcc592becbc8a9d6da3d7fc49009c4d00c