player: allow seeking audio between video frames

This allows seeking audio between two video frames that are relatively
far away.

The implementation of this is a bit subtle. It pretend the audio
position is different, and the actual PTS adjustment happens in audio.c
with this line:

    sync_pts -= mpctx->audio_delay - mpctx->delay;

Effectively this is the same as setting sync_pts to hrseek_pts after
this line, though. (I'm actually not sure if this could be written in a
more straightforward way; probably yes.)

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