File _constraints of Package gmic

<constraints>
 <hardware>
  <memory>
   <size unit="G">4</size>
  </memory>
 </hardware>
  <overwrite>
    <conditions>
      <arch>ppc64le</arch>
    </conditions>
    <hardware>
     <memory>
      <size unit="G">5</size>
     </memory>
    </hardware>
  </overwrite>
</constraints>