winecoreaudio: Accept up to 8 channels.

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

Hi,

WINETEST_INTERACTIVE=1 make wave.ok passes the
audible 4 and 6 channel tests.
Apple's auval tool mentions up to 8 channels so I believe
that's the limit.

(But I only have a mono built-in speaker to test.)

Regards,
	Jörg Höhle
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