refresh libusual

diff --git a/lib b/lib
index e383c38dbfaf3e485b615c3eb653e2addef58763..e4a86f4af27f958cdf8a6dcb08954ae6c745be6f 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit e383c38dbfaf3e485b615c3eb653e2addef58763
+Subproject commit e4a86f4af27f958cdf8a6dcb08954ae6c745be6f