>   x11-libs/libvdpau
>     selected: 1.4
>    protected: none
>      omitted: none
>

I'm guessing that would be pulled in by USE +vdpau, so if you've removed it
then done an emerge with -N or -U it won't be required anymore.

>
>  x11-drivers/xf86-video-amdgpu
>     selected: 19.1.0
>    protected: none
>      omitted: none
>

And that would be pulled in by
VIDEO_CARDS="amdgpu"