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

[Jon Roelofs via llvm-commits]

jroelofs wrote:

IIUC `__MACH__` means "the kernel is Mach, and we're going to be loaded by dyld", and `apple-none-macho` targets is _not_ that.

> as Swift expects all MachO targets to have that defined.

can you elaborate on that expectation?

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