vo: further reduce redundant wakeups

In display-sync mode, the core doesn't need to woken up every vsync, but
only every time a new actual video frame needs to be queued. So don't
wake up if there are still frames to repeat.

In audio-sync mode, the wakeup is simply redundant, since there's a
separate timer (in->wakeup_pts) to control when to queue a new frame. I
think.

This finally brings the required playloop iterations down to almost the
number of video frames. (As originally intended, really.)

Also a fairly risky change.

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