Compile Firefox with ffvp8 instead of libvpx

Registered by Sergey "Shnatsel" Davidoff

ffvp8 is a LGPL-licensed VP8 implementation from FFmpeg project, which is produces result bit-exact with libvpx, but faster (see http://x264dev.multimedia.cx/archives/499 for details). It's not likely to be included upstream because they don't want to complicate their licensing (see https://bugzilla.mozilla.org/show_bug.cgi?id=581773), but it should not be a problem for Ubuntu.

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