Does testbot's MingW miscompile winmm:midi tests?

Hi,

the subject should read
"Does test.winehq's MingW miscompile winmm:midi tests?"

Here's the summary of Saulius Krazuckas' testing on WinME machines:

- winmm_test.exe midi fails with INVALPARAM on test.winehq.org
  (winmm_test.exe extracted from winetest.exe)

+ No failures with a binary compiled on testbot.winehq.org,
   e.g. testbot job #4989

+ No failures with a MSVC-compiled binary

Now what to do next?
 - uninitialised memory issue?
 - bad MingW or includes on test.winehq?

How do MingW on test.winehq and testbot.winehq differ?

Regards,
 Jörg Höhle