winealsa: Initialize can fail with AUDCLNT_E_ENDPOINT_CREATE_FAILED.

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

I was fed up with the occasional generic failures in the winmm tests, so I started fixing it.
The winmm side is not ready for release yet.

If you study the render tests carefully, you'll notice that ENDPOINT_CREATE_FAILED
and UNSUP_FORMAT are returned depending on excl. vs. shared mode.  Here's a good
compromise that works well in Wine's setting, namely expecting the device to accept all
formats and perform conversion.

Regards,
 Jörg Höhle
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