Drop SGI_video_sync based method for vsync
With the new compositing timing, we want to start compositing some time later after a vsync event. This doesn't go along with the video sync based method to synchronize buffer swaps with vblank. Since practically all drivers nowadays provide support for the swap control extensions (GLX_EXT_swap_control, GLX_SGI_swap_control, or GLX_MESA_swap_control), it's safe to rely on them for the purpose of synchronizing buffer swaps to vblank.
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