[PATCH 0/2] MR6328: winevulkan: Add video interfaces.

[Elizabeth Figura (＠zfigura)]

Tested with win32 ffmpeg.

This merge request basically passes video.xml (and its parsed form) as an extra
argument where vk.xml is passed. While this is ad-hoc and not very future-proof,
there is no indication that Khronos will fragment its XMLs any further, and it
does not seem worthwhile to me to try to generalize the parsing logic in that
respect as long as only two XMLs are used. However, if the maintainers feel
differently, I will endeavour to do so.