Sync libusual

diff --git a/lib b/lib
index b25289f090c7efd797f4800f6842138691b244f1..2f0d8767f2b0ca3f4aacd46cde1fc93019a2ae70 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit b25289f090c7efd797f4800f6842138691b244f1
+Subproject commit 2f0d8767f2b0ca3f4aacd46cde1fc93019a2ae70