Apple Silicon (arm64) support

[rednoah]

• Support for building fpcalc for arm64 and publishing x86_64+arm64 universal binaries.

@lalinsky I'd be happy to hire you to work on M1 support for chromaprint tools.

[lalinsky]

I'll try to get it done, it seems like it should be possible to cross-compile from a x86_64 mac.

[wallisch]

I made a Swift package, ChromaSwift, that runs fine on arm64 macs.
No code changes necessary, apart from some clang warnings (see #88 & #89)

[lalinsky]

@rednoah I don't have a M1 mac, so I can't test it myself. Fat binaries for both architectures are now built. Could you try the chromaprint-fpcalc-macos-universal artifact from https://github.com/acoustid/chromaprint/actions/runs/1610515571? If everything works as expected, I'll make a new release with these builds.

[rednoah]

Nice. I ran it on a *.mp3 file and a *.flac file and it works for both.

[lalinsky]

https://github.com/acoustid/chromaprint/releases/tag/v1.5.1