D28511: Fix for older cmake versions

[Aleix Pol Gonzalez]

apol created this revision.
apol added reviewers: KWin, bshah.
Herald added a project: KWin.
Herald added a subscriber: kwin.
apol requested review of this revision.

REVISION SUMMARY
  Recent changes prevented it to build on KDE Neon.

TEST PLAN
  Built it on Neon

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D28511

AFFECTED FILES
  CMakeLists.txt
  autotests/libinput/CMakeLists.txt
  kcmkwin/kwinrules/CMakeLists.txt

To: apol, #kwin, bshah
Cc: kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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