File _constraints of Package blender

<constraints>
  <hardware>
   <disk>
    <size unit="G">20</size>
   </disk>
   <physicalmemory>
      <size unit="G">2</size>
   </physicalmemory>
   <memory>
      <size unit="G">4</size>
   </memory>
  </hardware>

  <overwrite>
  <!-- x86_64 has extra features like embree -->
    <conditions>
      <arch>x86_64</arch>
    </conditions>
    <hardware>
      <memory>
        <size unit="M">5500</size>
      </memory>
    </hardware>
  </overwrite>
</constraints>