vulkan/wsi: Add X11 adaptive sync support based on dri options.
The dri options are optional. When the dri options are not provided the WSI will not use adaptive sync. FWIW I think for xf86-video-amdgpu this still requires an X11 config option, so only people who opt in can get possible regressions from this. So then the remaining question is: why do this in the WSI? It has been suggested in another MR that the application sets this. However, I disagree with that as I don't think we'll ever get a reasonable set of applications setting it. The next questions is whether this can be a layer. It definitely can be as implemented now. However, I think this generally fits well with the function of the WSI. Furthemore, for e.g. the DISPLAY WSI this is much harder to do in a layer. Of course, most of the WSI could almost be a layer, but I think this still fits best in the WSI. Acked-by: Jason Ekstrand <firstname.lastname@example.org>
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