[programs/winetest] Extend PATH if we have dll's that only come with .NET

[Paul Vriens]

Hi,

This makes sure that if we have a dll that's only provided via .NET it can still
be found. Now both our extraction (and the generation of the subtest list) and
the real test will find the dll.

The downside (and hence this is a bit hackish) is that we extend the PATH for
every test. For now it's only gdiplus that needs this btw as that dll can also
exist without .NET (if I'm correct) and these tests directly import gdiplus.

Changelog
   Extend PATH if we have dll's that only come with .NET

-- 
Cheers,

Paul.

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