bdasup: Addendum to 40c15ec (r46632).
kmixer: Addendum to 3e489bf (r42143).
mmixer: Addendum to c42d9f2 (r44872).
stream: Addendum to 4a0debf (r41662).
Serge plans a follow up that will remove all other remaining YDEBUG in the source tree.
The ones covered here he considered to be the most trivial ones.
This lead to a crash of winmm:mixer
during "GCCLin_x86 on Test VBox".
The crash was exposed when new code paths
were activated by 0.4.15-dev-791-g
6d7ebc2048
I do intend to port this commit back into 0.4.14RC.
