Combine WINE_WAVEOUT and WINE_WAVEIN into single structure

[Jeremy White]

This combines the WINE_WAVEOUT and WINE_WAVEIN structures into
a single WINE_WAVECOMMON structure, as most of the fields were
duplicated anyways.  This patch should not change any
functionality, but will allow for some elimination
of duplicate code in an upcoming patch.

(Credit Alexandre for suggestion the combination into a single
structure).
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