ios: arm64: backport ffmpeg aarch64 support
ios: arm64: detect 64-bit build when packaging
ios: packaging scripts: compress with lzma

remove garbage files
add installed size entry for control file
add cydia icon file for ios app
ios: specify revision by argument for packaging script
ios: packaging script: remove curl from depends
ios: clamp video width to 1280 instead of 960

TODO: dirty hack for VideoToolbox bandwidth issue
      on older devices. need a better GPU2GPU patch
ios: arm64: disable video clamp for 64-bit devices