[Winmm/winealsa] Don't use asynchronous callbacks in dsound any more

[Maarten Lankhorst]

Instead of using asynchronous callbacks that uses signals, use a
seperate thread that can be cancelled, this prevents deadlock issues.

Basically we use snd_pcm_wait() that tells us when enough room is free
to commit another buffer, then we commit the previous buffer and make
the next buffer ready.

Since snd_pcm_wait() uses poll(), we don't have signals in winealsa any more.
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