Update embedded bmusb to v0.5.

diff --git a/bmusb b/bmusb
index d53ab27c6945636a8031e1868c503adeb7dad557..b9433278b3cca82312d3785e2e75a57375a8683c 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit d53ab27c6945636a8031e1868c503adeb7dad557
+Subproject commit b9433278b3cca82312d3785e2e75a57375a8683c