xaudio2: Explicitly version the 2.7 coclasses.
In versions 2.8 and later, no coclasses are provided by the API, so we
should version the old ones to make it clear they're out of date.
Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
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