winealsa: Implement a light form of locking for dsoutput

[Maarten Lankhorst]

 This differs from the previous attempts of locking by the fact it
doesn't try to lock everything, it only locks if an application tries to
write directly to writepos, which allows the mixer timer to write ahead
without alsa causing underruns. If an application has WRITEPRIMARY, the
mixer timer will call GetPosition with NULL arguments, which triggers
the old behavior again.

In less words: This causes the delay between writepos and playpos to be
dynamic, rather then static so dsound should experience less underruns.
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