refresh libusual

diff --git a/lib b/lib
index 39c15f18621adc36954870ab6dcd65bfe167bf18..bb8e55cb600836e95695f0cd633b4449c7904949 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit 39c15f18621adc36954870ab6dcd65bfe167bf18
+Subproject commit bb8e55cb600836e95695f0cd633b4449c7904949