wineoss volume cache patch

[Robert Reif]

Cache the wave volume so it can be returned rather
than the OSS derived value when possible.

The windows volume is much higher resolution than
what OSS uses.  If you write a windows volume and
read it back, it will most likely be different because
of truncation.  If the last saved windows volume when
converted matches what OSS returns, then use the
last windows volume rather than the OSS volume.

This has no effect in practice but does allow diagnostic
programs to not fail due to the truncation error.
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