Sync libusual

diff --git a/lib b/lib
index 6cc69da7beed13259094ee976bcc2d57c5edbf2e..f87b78edee3296ed6451a0bd03eeb12adddac810 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit 6cc69da7beed13259094ee976bcc2d57c5edbf2e
+Subproject commit f87b78edee3296ed6451a0bd03eeb12adddac810