python3Packages.tensorflowWithCuda: move assert to meta.broken (#426909)

# - the source build is currently brittle and not easy to maintain

# - the source build doesn't work on NVIDIA Jetson platforms

# unsupported combination

assert !(stdenv.hostPlatform.isDarwin && cudaSupport);

let

  packages = import ./binary-hashes.nix;

  inherit (cudaPackages) cudatoolkit cudnn;

      abbradar

    ];

    badPlatforms = [ "x86_64-darwin" ];

    # unsupported combination

    broken = stdenv.hostPlatform.isDarwin && cudaSupport;

  };

}