[MPlayer-dev-eng] delete draw_slice stub in vo_corevideo.m

[Zongyao Qu]

>
> There should be no such requirement, however a crash is possible
>  in cases that would have caused incorrect output already before.
> Basically not implementing draw_slice is incorrect for all VOs that
> support YUV formats, unless they use VOCAP_NOSLICES.
> ​
>
Here YUV formats, do you mean YUV Planar?
corevideo supports YUV interleaved.
​​

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