[Merge request] Fix plasma-workspace-dev dependency

[José Manuel Santamaría Lema]

Hi,

I have realized plasma-workspace-dev is declaring a dependency against 
plasma-workspace.
I think this is wrong because plasma-workspace contains only runtime files.

I have pushed the proposed change to this repository:
https://gitlab.com/siduction-kde-plasma5/plasma-workspace

in the kubuntu_wily_archive branch:
https://gitlab.com/siduction-kde-plasma5/plasma-workspace/commits/kubuntu_wily_archive_tmp

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