winmm: invoke DCB_FUNCTION callbacks on a different thread

[Damjan Jovanovic]

Changelog:
* invoke winmm DCB_FUNCTION callbacks on a different thread

Required behaviour inferred from a game whose callback unconditionally
calls SuspendThread() on the thread that called waveOutOpen(), thus
eternally suspending itself when the callback thread is the thread
that called waveOutOpen(), and working correctly with the patch
(#3930). Testing showed Windows 9x does the same.

Damjan Jovanovic
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