[PATCH v3 0/1] MR5816: wined3d: Implement wined3d_check_device_format_conversion().

[Elizabeth Figura (＠zfigura)]

This should reflect what we actually support, while still being a superset
of what native drivers actually support.

Native driver support varies, but, as the comments document, native drivers
(at least as of windows 10) support only RGB -> RGB, YUV -> RGB, and BC -> RGB
conversions. The actual formats supported are a more limited subset than exposed
(despite that the video cards should be perfectly capable of supporting more
conversions) but erring on the side of overreporting seems safer.

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  v3: wined3d: Implement wined3d_check_device_format_conversion().
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/5816