refresh libusual

diff --git a/lib b/lib
index 46aacc71141b0104c365793d1ac2040b4ac095b2..6e2a9dd0d9478d8386bb75ef7339e033d86534e2 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit 46aacc71141b0104c365793d1ac2040b4ac095b2
+Subproject commit 6e2a9dd0d9478d8386bb75ef7339e033d86534e2