Upgrade to newer bmusb, with namespacing.

[nageru] / bmusb

diff --git a/bmusb b/bmusb
index ec5eaa5e319e91f89db15dcbccdf64a056f710ae..c66728fa32fc79abd5c4fb9188750cccf9039dee 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit ec5eaa5e319e91f89db15dcbccdf64a056f710ae
+Subproject commit c66728fa32fc79abd5c4fb9188750cccf9039dee