Do not use the timing of dropped frames as part of the video master clock.

[nageru] / bmusb

diff --git a/bmusb b/bmusb
index e0837a17b5a497476d67237c768836e51f8a4ce7..a765e066b74ac52ff0abf239d430d6f8d83f792e 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit e0837a17b5a497476d67237c768836e51f8a4ce7
+Subproject commit a765e066b74ac52ff0abf239d430d6f8d83f792e