Request: Onnx support

[Madsfoto]

Since ffmpeg has onnx support, I would request the same support in the suite.
I have naïvely tried to add libonnx in ffmpeg_options.txt, but that's not enough and I don't know where else to add things.

[1480c1]

Will have to wait until https://packages.msys2.org/packages/mingw-w64-ucrt-x86_64-onnxruntime adds a libonnxruntime.a static library, otherwise it will require the .dll files to launch ffmpeg.exe.