gnu: Add ghc-streaming-commons.

* gnu/packages/haskell.scm (ghc-streaming-commons): New variable.

gnu: Add ghc-resourcet.

* gnu/packages/haskell.scm (ghc-resourcet): New variable.

gnu: Add hlint.

* gnu/packages/haskell.scm (hlint): New variable.

gnu: Add ghc-haskell-src-exts.

* gnu/packages/haskell.scm (ghc-haskell-src-exts): New variable.

gnu: Add ghc-happy.

* gnu/packages/haskell.scm (ghc-happy): New variable.

gnu: Add ghc-cmdargs.

* gnu/packages/haskell.scm (ghc-cmdargs): New variable.

gnu: Add cpphs.

* gnu/packages/haskell.scm (cpphs): New variable.

gnu: Add ghc-simple-reflect.

* gnu/packages/haskell.scm (ghc-simple-reflect): New variable.

gnu: Add ghc-adjunctions.

* gnu/packages/haskell.scm (ghc-adjunctions): New variable.

gnu: Add ghc-free.

* gnu/packages/haskell.scm (ghc-free): New variable.

gnu: Add ghc-prelude-extras.

* gnu/packages/haskell.scm (ghc-prelude-extras): New variable.

gnu: Add ghc-reflection.

* gnu/packages/haskell.scm (ghc-reflection): New variable.

gnu: Add ghc-reducers.

* gnu/packages/haskell.scm (ghc-reducers): New variable.

gnu: Add ghc-semigroupoids.

* gnu/packages/haskell.scm (ghc-semigroupoids): New variable.

gnu: Add ghc-profunctors.

* gnu/packages/haskell.scm (ghc-profunctors): New variable.

gnu: Add ghc-extra.

* gnu/packages/haskell.scm (ghc-extra): New variable.

gnu: Add ghc-polyparse.

* gnu/packages/haskell.scm (ghc-polyparse): New variable.

gnu: Add HScolour.

* gnu/packages/haskell.scm (hscolour): New variable.

gnu: Add ghc-comonad.

* gnu/packages/haskell.scm (ghc-comonad): New variable.

gnu: Add ghc-distributive.

* gnu/packages/haskell.scm (ghc-distributive): New variable.