ghc-parser: add missing build-tools directive
ghc-parser: add missing build-tools directive

sumitsahrawat/IHaskell,qzchenwl/IHaskell,FranklinChen/IHaskell,kfiz/IHaskell,artuuge/IHaskell,wyager/IHaskell,franklx/IHaskell,wyager/IHaskell,FranklinChen/IHaskell,qzchenwl/IHaskell,kfiz/IHaskell,FranklinChen/IHaskell,artuuge/IHaskell,thomasjm/IHaskell,FranklinChen/IHaskell,beni55/IHaskell,kfiz/IHaskell,thomasjm/IHaskell,qzchenwl/IHaskell,gibiansky/IHaskell,qzchenwl/IHaskell,wyager/IHaskell,franklx/IHaskell,gibiansky/IHaskell,gibiansky/IHaskell,wyager/IHaskell,thomasjm/IHaskell,beni55/IHaskell,beni55/IHaskell,artuuge/IHaskell,artuuge/IHaskell,sumitsahrawat/IHaskell,sumitsahrawat/IHaskell,franklx/IHaskell,franklx/IHaskell,beni55/IHaskell,kfiz/IHaskell,thomasjm/IHaskell