winealsa: Have the MIDI recorder wait in poll(), not snd_seq_event_input().

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

Compare with wineoss which uses poll <= 0 already...

Johannes Kroll mentioned that MIDIIn takes a long time to end.
Indeed, our testsuite ran 3 times into the "kill after 5s" timeout due to this bug.
Now the tests execute much faster.

Regards,
 Jörg höhle
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