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backend/drm: return secondary backend DRM FD

Simon Ser requested to merge emersion/wlroots:drm-backend-fd into master

It can be useful for compositors to get the real DRM FD instead of the one from the parent compositor. For instance, some compositors might want to perform some DRM IOCTLs there to check the driver name, fetch some DRM resources, etc. This will also be a requirement for direct scanout on secondary GPUs.

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