haskell-defaults.nix: build Cabal 1.22.x with binary 0.7.x on GHC versions < 7.8.x
haskell-defaults.nix: build Cabal 1.22.x with binary 0.7.x on GHC versions < 7.8.x

https://github.com/haskell/cabal/issues/2322

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