Bump libusual

diff --git a/lib b/lib
index 395b2d257d6f9a5d3178e9a9e44ce80291074960..e90ca270d50183d8a697caa3dd7060449d7948d3 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit 395b2d257d6f9a5d3178e9a9e44ce80291074960
+Subproject commit e90ca270d50183d8a697caa3dd7060449d7948d3