Bug#735742: circular dependency with libav (libavformat-dev)

[Helge Deller]

Package: x264

Package x264 has a circular build-dependency with libav (libavformat-dev).
I mean, the libav package build-depends on x264, and vice versa.
This prevented building x264 and libav on a new debian platform.
I fixed it manually for the hppa platform, but nevertheless, I think this should be fixed.

Helge