xf86drmMode: add drmModeCloseFB()
See https://lore.kernel.org/dri-devel/20231020101926.145327-2-contact@emersion.fr/
Still a draft because needs a kernel header update.
See https://lore.kernel.org/dri-devel/20231020101926.145327-2-contact@emersion.fr/
Still a draft because needs a kernel header update.