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backends/drm: use closefb instead of removefb when available

Xaver Hugl requested to merge work/zamundaaa/closefb into master

The closefb ioctl removes the userspace reference from the framebuffer but does not try to disable planes and outputs if the buffer is still used. This allows for example for smoother transitions between SDDM and the Plasma session

draft until https://lore.kernel.org/dri-devel/20231016142510.3109-2-contact@emersion.fr/ is merged upstream

Edited by Xaver Hugl

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