Don't build ghcPkg in Stage1
Don't build ghcPkg in Stage1

izgzhen/hadrian,snowleopard/hadrian,sdiehl/ghc,sdiehl/ghc,snowleopard/shaking-up-ghc,sdiehl/ghc,bgamari/shaking-up-ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc