D23635: Fix build with cmake < 3.7

[Ralf Habacker]

This revision was automatically updated to reflect the committed changes.
Closed by commit R139:efafb44002bc: Fix build with cmake < 3.7 (authored by habacker).

REPOSITORY
  R139 Umbrello

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D23635?vs=65110&id=65193

REVISION DETAIL
  https://phabricator.kde.org/D23635

AFFECTED FILES
  CMakeLists.txt

To: wbauer, #umbrello, habacker
Cc: umbrello-devel, vanderbilt
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