dlls/winmm/winecoreaudio/audio.c: fix race condition in drvclose

[Nick Burns]

This patch fixes a race condition that happens in winecfg (the only place I 
ever see this crash) caused by the messageThread being alive after the 
driver has been closed.

So -- on drvclose/coreaudio_waverelease -- I wait for the messageThread to 
finish -- verify it has finished -- and clean it up.

I would prefer to wait for the messageThread to start in coreaudio_waveinit 
as well.
But cannot because the messageThread will not start executing (due to loader 
locks) this leads to deadlock (if you try to wait for a signal that the 
messageThread has started).

There could be problems with startup and playing sounds (really fast) -- but 
im not sure about that yet...

- Nick

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