winmm/tests: test mciSendString with non-null return string buffer

Dan Kegel dank at
Fri Jul 18 20:56:45 CDT 2008

Valgrinding Picasa showed warnings in call to mciSendString.
This patch adds two short mciSendString tests that
do very simple checks of how it uses the output buffer.
This produces the same kind of Valgrind warnings as
showed up in Picasa.

The new tests pass under Windows XP, and I've added
todo's for the ones that don't pass yet in Wine.

I'll leave the actual bug fixing to somebody who understands mci
better (or has the time to learn it).
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