refresh libusual

diff --git a/lib b/lib
index e67d8210bfe4ec342654160e98a7ae33d5d31257..5dcdc9861b9de56a33be2c9b35f798fd41c8d57b 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit e67d8210bfe4ec342654160e98a7ae33d5d31257
+Subproject commit 5dcdc9861b9de56a33be2c9b35f798fd41c8d57b