[DEVOPS-831] Static linking fixes nix build on macOS Sierra
[DEVOPS-831] Static linking fixes nix build on macOS Sierra

This was previously worked around by weeding out dependencies but
disabling shared libraries also solves the problem.

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