hackage-packages.nix: update Haskell package set
This update was generated by hackage2nix v20151217-5-ged07a8e using the following inputs: - Nixpkgs:665c16fbe1- Hackage:d9755ca900- LTS Haskell:d3e5ae70f9- Stackage Nightly:56e1f693d5
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