D22984: Fix build with cmake < 3.7

[Wolfgang Bauer]

This revision was automatically updated to reflect the committed changes.
Closed by commit R318:68aee5ed51b5: Fix build with cmake < 3.7 (authored by wbauer).

REPOSITORY
  R318 Dolphin

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D22984?vs=63262&id=63294

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

AFFECTED FILES
  CMakeLists.txt

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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