D22990: Fix build with older cmake

[Wolfgang Bauer]

This revision was automatically updated to reflect the committed changes.
Closed by commit R336:36c658aaec85: Fix build with older cmake (authored by wbauer).

CHANGED PRIOR TO COMMIT
  https://phabricator.kde.org/D22990?vs=63272&id=63295#toc

REPOSITORY
  R336 KTouch

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D22990?vs=63272&id=63295

REVISION DETAIL
  https://phabricator.kde.org/D22990

AFFECTED FILES
  CMakeLists.txt

To: wbauer, gottfried
Cc: kde-edu, #kde_applications, fbampaloukas, alexeymin, genaxxx, jriddell, narvaez, apol
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