[Merge request] Fix marble FTBFS for kubuntu_vivid_backports

[José Manuel Santamaría Lema]

Hi,

current marble from kubuntu_vivid_backports doesn't build because there is 
a library package which must be renamed. I did the rename, but also you should
provide a symbols file (which I didn't have time to create for you). Anyway, I'm 
offering you the patch for the rename.

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

in the kubuntu_vivid_backports_tmp branch:
https://gitlab.com/siduction-kde-applications/marble/commits/kubuntu_vivid_backports_tmp

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