gnu: Add ghc-haddock-library.

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

gnu: Add Idris.

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

gnu: Add ghc-trifecta.

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

gnu: Add ghc-cheapskate.

* gnu/packages/haskell.scm (ghc-cheapskate): Add variable.

gnu: Add ghc-lens.

* gnu/packages/haskell.scm (ghc-lens): Add variable.

gnu: Add ghc-kan-extensions.

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

gnu: Add ghc-vector-binary-instances.

* gnu/packages/haskell.scm (ghc-vector-binary-instances): New variable.

gnu: Add ghc-wai-extra.

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

gnu: Add ghc-wai-logger.

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

gnu: Add ghc-wai.

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

gnu: Add ghc-cookie.

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

gnu: Add ghc-parsers.

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

gnu: Add ghc-xss-sanitize.

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

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.