os/mac/version: update method signatures
os/mac/version: update method signatures

EricFromCanada/brew,vitorgalvao/brew,vitorgalvao/brew,sjackman/homebrew,JCount/brew,nandub/brew,sjackman/homebrew,vitorgalvao/brew,MikeMcQuaid/brew,JCount/brew,JCount/brew,Homebrew/brew,EricFromCanada/brew,Homebrew/brew,claui/brew,nandub/brew,MikeMcQuaid/brew,JCount/brew,sjackman/homebrew,Homebrew/brew,claui/brew,EricFromCanada/brew,nandub/brew,claui/brew,Homebrew/brew,MikeMcQuaid/brew,nandub/brew,MikeMcQuaid/brew,sjackman/homebrew,vitorgalvao/brew,claui/brew,EricFromCanada/brew