WIP linux-dmabuf vesion 6 (target device) #1273
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Basic implementation of https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/268.
Can be tested along with https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26912.
Will require compositor to do something with the
target_device
for this to be useful. So far this and the Mesa PR don't do anything too interesting, but should be a good start for trying to improve how multiple GPUs are handled.