gnu: Add ghc-word8.

* gnu/packages/haskell.scm (ghc-word8): New variable.

gnu: Add ghc-lifted-base.

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

gnu: Add ghc-regex-tdfa-rc.

* gnu/packages/haskell.scm (ghc-regex-tdfa-rc): New variable.

gnu: Add ghc-charset.

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

gnu: Add ghc-fast-logger.

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

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.