Add support for new keys in package-data files.
Add support for new keys in package-data files.

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