[clang] [llvm] [Darwin][Driver][clang] apple-none-macho orders the resource directory after internal-externc-isystem when nostdlibinc is used (PR #120507)

[Ian Anderson via llvm-commits]

ian-twilightcoder wrote:

@TNorthover do you know if there was any specific reason to make sure that apple-none-macho doesn't define `__MACH__`? All of the uses I could find contrast that with `__ELF__` and take it to mean "producing a Mach object/using the Apple linker" and not "code that will run under a Mach-based kernel".

https://github.com/llvm/llvm-project/pull/120507