gnu: Add "static" output to Haskell packages with custom outputs.

gnu: Add "static" output to Haskell packages with custom outputs.

All these packages have non-standard outputs.  As a result the build system
cannot automatically add the "static" output, so we do this manually.

* gnu/packages/haskell-check.scm (ghc-quickcheck, ghc-hunit)[outputs]: Add
"static" output.
* gnu/packages/haskell-web.scm (ghc-http)[outputs]: Same.
* gnu/packages/haskell-xyz.scm (ghc-case-insensitive, ghc-fgl, ghc-hashable,
ghc-network, ghc-network-uri, ghc-parallel, ghc-paths, ghc-primitive,
ghc-random, ghc-split, ghc-syb, ghc-tf-random, ghc-unordered-containers,
ghc-vector, ghc-zlib)[outputs]: Same.