mciavi: Simplify play loop.

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

Hi,

in the future, MCIAVI will hopefully be able to drive the loop
with either audio or video turned on or off individually
(setaudio/setvideo off), like native (e.g. mciavi can play
the audio tracks only).
Here's a first step towards unification.

Regards,
	Jörg Höhle
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