title: macOS build universal binary 2 with CMake
body: <p>How would I build a Universal Binary 2 that supports both Intel and Apple Silicon using CMake/Make?
  I have found some documentation here - <a href="https://developer.apple.com/documentation/xcode/building_a_universal_macos_binary" rel="noreferrer">https://developer.apple.com/documentation/xcode/building_a_universal_macos_binary</a> - but that uses XCode, which i'm not using in my project.
  Thanks!</p>