liushuyu f91b6fbbcb ffmpeg: move the whole tree into externals/ffmpeg/ffmpeg ... ...

* this resolves the todo items in the CMakeLists.txt
* a version requirement check for ffmpeg is added to catch issues early
* for future-proof reasons, nasm/yasm is now only required when build on
  x86/AMD64 systems

2021-12-13 17:48:05 -07:00

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