File _constraints of Package qt6-wayland

<constraints>
  <hardware>
    <memory>
      <size unit="G">5</size>
    </memory>
  </hardware>
  <!-- relax constraints for qt6-wayland:docs -->
  <overwrite>
    <conditions>
      <package>qt6-wayland:docs</package>
    </conditions>
    <hardware>
      <memory>
        <size unit="G">2</size>
      </memory>
    </hardware>
  </overwrite>
</constraints>