refresh libusual

diff --git a/lib b/lib
index 7d7a4af1cbac3fa4338e4c7aefcb680f88337a64..610a5a9f0de5308e617e96910abf0aa3e453a83c 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit 7d7a4af1cbac3fa4338e4c7aefcb680f88337a64
+Subproject commit 610a5a9f0de5308e617e96910abf0aa3e453a83c