[PATCHv2] xaudio2: Use new features from FAudio 19.06 (but keep compatibility for <=19.05)

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=52747

Your paranoid android.


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