os/mac/xcode: support Xcode 13
os/mac/xcode: support Xcode 13

MikeMcQuaid/brew,nandub/brew,Homebrew/brew,Homebrew/brew,EricFromCanada/brew,nandub/brew,nandub/brew,EricFromCanada/brew,EricFromCanada/brew,nandub/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,JCount/brew,EricFromCanada/brew,Homebrew/brew,Homebrew/brew,JCount/brew,JCount/brew,MikeMcQuaid/brew,JCount/brew