gnu: Add ghc-bytestring-builder.

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

gnu: Add ghc-tagsoup.

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

gnu: Add ghc-digest.

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

gnu: Add ghc-contravariant.

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

gnu: Add ghc-statevar.

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

gnu: Add ghc-bifunctors.

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

gnu: Add ghc-void.

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

gnu: Add ghc-semigroups.

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

gnu: Add ghc-nats.

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

gnu: Add ghc-http-types.

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

gnu: Add ghc-quickcheck-instances.

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

gnu: Add ghc-unix-compat.

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

gnu: Add ghc-unix-time.

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

gnu: Add ghc-iproute.

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

gnu: Add ghc-unbounded-delays.

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

gnu: Add ghc-tagged.

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

gnu: Add ghc-auto-update.

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

gnu: Add ghc-doctest.

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

gnu: Add ghc-blaze-html.

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

gnu: Add ghc-blaze-markup.

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