libtoxcore: Add libopus and libvpx to buildInputs.
libtoxcore: Add libopus and libvpx to buildInputs.

Those are necessary to do audio/video calls, which I guess is the whole
point of the Tox project.

Signed-off-by: aszlig <ee1aa092358634f9c53f01b5a783726c9e21b35a@redmoonstudios.org>

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