Function add_apple_link_args

fn add_apple_link_args(
    cmd: &mut dyn Linker,
    sess: &Session,
    flavor: LinkerFlavor,
)

We need to communicate five things to the linker on Apple/Darwin targets:

• The architecture.
• The operating system (and that it’s an Apple platform).
• The environment / ABI.
• The deployment target.
• The SDK version.