Revert "[CSE-678] Compile with nix (OSX support needed)"
Revert "[CSE-678] Compile with nix (OSX support needed)"

This reverts commit cd7829f307c2441435863aff7d8eb2646b4dc916.

input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype