halide: use preCheck instead of overwriting checkPhase

  # Note: disable mullapudi2016_fibonacci because it requires too much

  # parallelism for remote builders

  ctestArgs = "--output-on-failure -E 'mullapudi2016_fibonacci'";

  checkPhase = ''

    runHook preCheck

    ctest ${ctestArgs}

    runHook postCheck

  preCheck = ''

    checkFlagsArray+=("ARGS=-E 'mullapudi2016_fibonacci'")

  '';

  # Note: only openblas and not atlas part of this Nix expression