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Add generic drm framebuufer interface

Simon Ser requested to merge github/fork/hizukiayaka/allocator-fixup into master

Created by: hizukiayaka

Although it sounds that only the drm backend would use the drm framebuffer, but I am sure it would be necessary that we could bring a dmabuf which is allocated by somewhere else to be used in gbm or just drm itself.

We could skip those gbm back-compatible code but weston has them but it would detect the requirement of keeping compatible based on gbm version, I would prefer to do a symbol checking, that is all.

@emersion I modified some patches from you for SHM, to work with the other PR you have known.

I didn't full adapt the drm dumb buffer to use drm_dumb_buffer, it could as its only private data is a struct storing the gem handle.

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