D22984: Fix build with cmake < 3.7

[Nathaniel Graham]

ngraham accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D22984

To: wbauer, #dolphin, ngraham
Cc: kfm-devel, #dolphin, aprcela, vmarinescu, fprice, fbampaloukas, alexde, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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