refresh libusual

diff --git a/lib b/lib
index 9f71a708ab258e680b1b2f001d4138834042c7f4..267b0c54e09558ca66de73f64e9778e847a31413 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit 9f71a708ab258e680b1b2f001d4138834042c7f4
+Subproject commit 267b0c54e09558ca66de73f64e9778e847a31413