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backends/virtual: Port to gbm

Vlad Zahorodnii requested to merge work/zzag/virtual-backend-gbm-allocator into master

The virtual backend uses the surfaceless platform. On the other hand, we move in a direction where the graphics buffer type is explicit, which creates issues for the virtual backend.

This change ports the virtual backend to gbm so we could manually allocate dmabuf buffers in order to unify buffer handling in kwin.

Its main drawback is that you won't be able to use the virtual backend on setups without render nodes. On the other hand, given that the compositor is meaningless without clients being able to share buffers with it, it's reasonable to require some way to create and export prime buffers.

Draft: would need to ask sysadmins for vgem kernel module in CI after receiving an ACK for this MR

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