debrew: fix irb start
debrew: fix irb start

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