hackage-packages.nix: update Haskell package set
This update was generated by hackage2nix v20151217-9-geddefc2 using the following inputs: - Nixpkgs:066b92d429- Hackage:e664cee71e- LTS Haskell:9b9c0dc0e3- Stackage Nightly:c5293e6b9b
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