wined3d: turn blit_shader color_fixup_supported into blit_supported

[Roderick Colenbrander]

Hi,

This is an updated version of the previous blit_supported patch. I
have disabled any destination fixups for now until the code is
rewritten. It also helped that RealizePalette isn't using
color_fixup_supported anymore which led to some of the horrible
checks.

Regards,
Roderick Colenbrander
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