[Bug 43062] Installer from GOG.com displays black rectangles

https://bugs.winehq.org/show_bug.cgi?id=43062

--- Comment #3 from Alexandre Julliard <julliard(a)winehq.org> ---
That's a gdiplus bug, it uses SHADEBLENDCAPS to check if alpha blending is
supported, but the meaning is different on display devices. Quoting MSDN: 
"For a display device, all blending operations are available; besides SB_NONE,
the only return values are SB_CONST_ALPHA and SB_PIXEL_ALPHA, which indicate
whether these operations are accelerated."
It works OK with native gdiplus.

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