mciavi should be rewritten using the AVIFile interface

[Dmitry Timoshkov]

<Joerg-Cyril.Hoehle at t-systems.com> wrote:

> Hence mciavi.c should be rewritten to use the AVIFile API.  I hope
> that doing so will prevent a skew that I've observed with some apps,
> where sound and video rendering do not match after a few seconds.

It would be better to find and fix an actual bug instead of introducing
a bunch of new ones with the rewrite. Same with mciseq.

-- 
Dmitry.