Fix path to clone folder.
Fix path to clone folder.

See #110. [skip ci]

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