mciseq: Prevent busy-wait while paused.

Hi,

any comment on that patch? It's currently the bottommost in
source.winehq.org/patches hence may fall into the bitbucket anytime.

I had noticed that the MCI MIDI player would busy loop while paused
because of a while(xyz) ; statement therein.

Test it using these MCI commands
open c:\data\foo.mid alias m
play m
pause m

So I simply added a Sleep() and wrote:
> 7 ms is arbitrary. It allows to sleep well yet be responsive enough
> so the app doesn't wait too long should the next command be MCI_Stop.
> For the ear, an even larger sleep would be good enough.

Sleep is a sort of stop gap until someone invents a
notification/setEvent/Resume patch or whatever would be TRT.

Regards,
 Jörg Höhle