dsound: Allow a special cbSize case in CreateSoundBuffer (updated)

[Jesse Allen]

In CreateSoundBuffer, some apps pass sizeof(WAVEFORMATEXTENSIBLE) for
the cbSize and we have to allow it, but only when the SubFormat is
KSDATAFORMAT_SUBTYPE_PCM.

This updated patch is simpler... at the expense of being less clear ;)

Includes test cases which were verified on WinXP.
Fixes bug #11716
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