gnu: Add ghc-http-client.

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

gnu: Add ghc-mime-types.

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

gnu: Add ghc-hslua.

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

gnu: Add ghc-sha.

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

gnu: Add ghc-juicypixels.

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

gnu: Add ghc-mmap.

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

gnu: Add ghc-filemanip.

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

gnu: Add ghc-yaml.

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

gnu: Add ghc-mockery.

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

gnu: Add ghc-logging-facade.

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

gnu: Add ghc-conduit.

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

gnu: Add ghc-hspec-contrib.

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

gnu: Add ghc-aeson-qq.

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

gnu: Add ghc-haskell-src-meta.

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

gnu: Add ghc-th-orphans.

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

gnu: Add ghc-th-reify-many.

* gnu/packages/haskell.scm (ghc-th-reify-many): New variable.

gnu: Add ghc-th-expand-syns.

* gnu/packages/haskell.scm (ghc-th-expand-syns): New variable.

gnu: Add ghc-th-lift.

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

gnu: Add ghc-packedstring.

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

gnu: Add ghc-enclosed-exceptions.

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