Add support for Apple Silicon

[emoon]

https://developer.apple.com/documentation/apple_silicon

Plugins:

• According to Apple possible to compile with both -arch x86_64 and -arch arm64 on the same commandline for Clang. This will solve pretty much all decoder plugins.

Unknown:

• Qt (was listed in WWDC that Apple had patches for so hopefully new version soon)
• Rust - Tracking issue here Tracking issue for supporting macOS on Apple Silicon (a.k.a arm64, M1, M2, aarch64) rust-lang/rust#73908

[shepmaster]

• and -arch amd64

I think you mean -arch arm64. Also worth keeping an eye on arm64e

[Brog33]

I would love to beta test an Apple Silicon build. This issue was opened 3,5 years ago when Apple Silicon was in its infancy, hopefully it's less hassle to compile now :)