[Bug 48062] Detect and report WineTest's "load errors"

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48062

--- Comment #1 from François Gouget  ---
The "mfplat=load error 1359" error is legitimate on Windows XP.

It happens because mfplat_test.exe imports d3d11.dll which is missing. This
triggers a #32770 dialog saying so and blocks the process. As a result
WineTest.exe does not get the subtest list and issues the 'load error 1359'
error.

So to avoid false positives WineTest must be modified to detect this #32770
dialog  and properly report the missing dll. Only then can the other 'load
error 1359' errors be detected and reported.