Update to VideoIO.jl

* Use new BinDeps features like library groups

* Update build incantations for new versions/platforms

* Remove all postproc stuff

* update REQUIRES

This builds and loads on my mac, but the tests fail because it can't grab a certain file from archive.org.  This PR is a little cavalier in how it throws stuff out, so feel free to iterate with me here to get it to be what you want.
Actually, those appear quite a few other places, so we can take care of that in a separate commit.