D15538: Removes Cmake warnings by replacing deprecated method and setting cmake minimum version to 3.3

[Luan Simões]

luansimoes added reviewers: tcanabrava, KDE Edu.

REPOSITORY
  R73 Rocs

REVISION DETAIL
  https://phabricator.kde.org/D15538

To: luansimoes, tcanabrava, #kde_edu
Cc: kde-edu, narvaez, apol
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