[WINEALSA]Improve dsound driver

[Jerry Jenkins]

Since there is no synchronization between mixing
thread and the callback that transfers mixed data to
alsa driver, part of the data we write to alsa driver
is garbage, which make noticeable noise.

My patch makes dsound driver access alsa driver's
buffer directly just like what wineoss dsound driver
does.

ChangeLog:
	Improve winealsa dsound driver by accessing sound
driver's buffer directly in an undocumented way.


		
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