Make `cask/macos` constants private.
Make `cask/macos` constants private.

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