bottle: calculate rebuild correctly when removing `bottle :unneeded`
bottle: calculate rebuild correctly when removing `bottle :unneeded`

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