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Draft: virgl: add support for DRI3 with vtest backend

Louis-Francis Ratté-Boulianne requested to merge lfrb/mesa:vtest-dri3 into main

Add support for resource export when using virgl vtest backend. That also allows us to tentatively use DRI3 to reduce number of copies when presenting. The LIBGL_ALWAYS_SOFTWARE environment variable shouldn't be set to use that path.

I'm opening as a draft as there are probably a lot of corner cases not handled, but I want to get some feedback about the general idea.

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