Remove redundant GHC extensions.

src/Base.hs

-{-# LANGUAGE FlexibleInstances #-}
-
 module Base (
     module Development.Shake,
     module Development.Shake.FilePath,

src/Oracles.hs

-{-# LANGUAGE TypeFamilies, FlexibleInstances, FlexibleContexts, NoImplicitPrelude #-}
-{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving, ConstraintKinds #-}
-
 module Oracles (
     module Oracles.Base,
     module Oracles.Flag,

src/Oracles/Base.hs

-{-# LANGUAGE TypeFamilies, FlexibleInstances, FlexibleContexts, MultiParamTypeClasses #-}
-{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving, ConstraintKinds #-}
+{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving #-}
 
 module Oracles.Base (
     ConfigKey (..),

src/Oracles/Builder.hs

-{-# LANGUAGE TypeFamilies, FlexibleInstances, FlexibleContexts, NoImplicitPrelude #-}
-{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving, ConstraintKinds #-}
+{-# LANGUAGE NoImplicitPrelude #-}
 
 module Oracles.Builder (
     Builder (..),

src/Oracles/Flag.hs

-{-# LANGUAGE TypeFamilies, FlexibleInstances, FlexibleContexts, MultiParamTypeClasses #-}
-{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving, ConstraintKinds #-}
+{-# LANGUAGE TypeFamilies, FlexibleInstances, MultiParamTypeClasses #-}
 
 module Oracles.Flag (
     module Control.Monad,

src/Oracles/Option.hs

-{-# LANGUAGE TypeFamilies, FlexibleInstances, FlexibleContexts, MultiParamTypeClasses #-}
-{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving, ConstraintKinds #-}
-
 module Oracles.Option (
     Option (..),
     option, argOption,

src/Oracles/PackageData.hs

-{-# LANGUAGE TypeFamilies, FlexibleInstances, FlexibleContexts, MultiParamTypeClasses #-}
-{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving, ConstraintKinds #-}
+{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving #-}
 
 module Oracles.PackageData (
     PackageDataPair (..),