Add a Stack build script for Windows
Add a Stack build script for Windows

See #283

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