formula_auditor: don't allow `bottle :unneeded` in core.
formula_auditor: don't allow `bottle :unneeded` in core.

Now we have `all:` bottles and Bintray is going away for `mirror`s:
let's bottle everything in Homebrew/homebrew-core.

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