ffmpeg needs manual rebuild on m68k for x264/x265 transitions

[Andreas Cadhalpun <andreas.cadhalpun@googlemail.com>]

Hi,

ffmpeg is currently BD-uninstallable on m68k, because it hasn't been
rebuilt for the x265 transition. This also blocks the x264 transition.

I think the fastest way to fix this is to do a manual rebuild of x264
with the old x265 binaries installed and then build ffmpeg with the
new x264/x265 libraries.

Best regards,
Andreas