D22983: Fix build with cmake < 3.7

[Wolfgang Bauer]

wbauer marked an inline comment as done.

REPOSITORY
  R36 Ark

REVISION DETAIL
  https://phabricator.kde.org/D22983

To: wbauer, #ark
Cc: dakon, kde-utils-devel, #ark, fbampaloukas, tctara
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