winmm: winmm_test.exe fix for CALLBACK_THREAD race

[Stéphan Kochen]

[I sent this to just wine-devel before, sorry!]

"wine winmm_test.exe wave" reliably locks up for me after calling
waveOutOpen() with the CALLBACK_THREAD flag, waiting for a WOM_OPEN
message to arrive. Which never happens because I believe the thread
doesn't have a message queue.

This patch implements the solution mentioned in the "remarks" section of
the MSDN page on PostThreadMessage:
http://msdn2.microsoft.com/en-us/library/ms644946.aspx

Regards,
-- Stéphan
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