Mediacodec support

[MaixGit]

Describe the bug
The hardware accelerated mediacodec(s) seem to be missing from the build, as ffmpeg doesn't find either the h264 or hevc encoder when specified in the custom options.

Settings applied
Clean install with "-vcodec h264_mediacodec" as the custom video codec.

App Logs
This is with a clean install, so the only relevant bit is that it doesn't recognise the encoder

File used
Any file.

Maybe I'm reading into it a bit too much, but on the Android.sh page of ffmpeg-kit's wiki, the libraries build flag has a different format:

vs the one in the ffmpeg build log from the app logs:

Apologies if I've missed something, but I can't get it working.