File _constraints of Package ocaml-parmap

<constraints>
  <overwrite>
    <conditions>
      <arch>aarch64</arch>
      <arch>ppc64le</arch>
      <arch>s390x</arch>
      <arch>x86_64</arch>
    </conditions>
    <hardware>
      <memory>
        <size unit="G">8</size>
      </memory>
    </hardware>
  </overwrite>
</constraints>