D23638: Fix build with cmake < 3.7

[Wolfgang Bauer]

This revision was automatically updated to reflect the committed changes.
Closed by commit R73:a698894fdaac: Fix build with cmake < 3.7 (authored by wbauer).

REPOSITORY
  R73 Rocs

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D23638?vs=65113&id=65167

REVISION DETAIL
  https://phabricator.kde.org/D23638

AFFECTED FILES
  CMakeLists.txt

To: wbauer, #rocs, aacid
Cc: kde-edu, narvaez, apol
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