File _constraints of Package digikam

<constraints>
  <hardware>
    <disk>
      <size unit="M">4500</size>
    </disk>
  </hardware>
  <overwrite>
    <conditions>
      <arch>ppc64le</arch>
    </conditions>
    <hardware>
       <disk>
         <size unit="M">6000</size>
       </disk>
    </hardware>
  </overwrite>
</constraints>