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backend/drm: fix drmModePageFlip() when disabling CRTC on legacy uAPI

Simon Ser requested to merge emersion/wlroots:legacy-disable-crtc-page-flip into master

drmModePageFlip() will fail with EBUSY on a disabled CRTC.

We can't fix this by clearing the DRM_MODE_PAGE_FLIP_EVENT when performing a commit which disables CRTCs, because some device-wide commits might also page-flip other enabled CRTCs (and skipping the page-flip event would mess up our buffer tracking).

Fix this by immediately completing page-flips which disable a CRTC on the legacy uAPI.

Closes: #3918 (closed)

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