dlls/winmm/wineoss/audio.c patch

[Robert Reif]

This patch fixes a bug where the enable state of the
output and input were not set properly when doing full duplex.

This patch fixes a bug where resetting the output would
affect the capture when doing full duplex.

These are minimal fixes and a better solution should be
used in the future to keep the two threads from
interfering with each other and the app.  However this
does make full duplex stable for me.  Also, stopping and
restarting capture and playback together is still problematic.
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