[Merge request] Fix kdesu upgrades to wily

[José Manuel Santamaría Lema]

Hi,

I think current kdesu from kubuntu_wily_archive is going to fail to upgrade 
from vivid.

I have pushed the proposed change to this repository:
https://gitlab.com/siduction-kde-frameworks/kdesu

in the kubuntu_wily_archive branch:
https://gitlab.com/siduction-kde-frameworks/kdesu/commits/kubuntu_wily_archive_tmp

Also I'm attaching the patch retrieved with git format-patch.
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