D23638: Fix build with cmake < 3.7

[Wolfgang Bauer]

wbauer created this revision.
wbauer added a reviewer: Rocs.
wbauer added a project: Rocs.
Herald added a project: KDE Edu.
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REVISION SUMMARY
  `VERSION_GREATER_EQUAL was introduced in cmake 3.7, but the specified minimum version is 3.3.
  So use `NOT VERSION_LESS` instead to still support older cmake versions too.

TEST PLAN
  rocs master builds fine with cmake 3.5.2 now, and also newer versions (haven't tried older versions).
  
  Before, I got this error when using cmake 3.5.2:
  
    CMake Error at CMakeLists.txt:85 (if):
      if given arguments:
    
        "KF5Declarative_VERSION" "VERSION_GREATER_EQUAL" "5.45"
    
      Unknown arguments specified

REPOSITORY
  R73 Rocs

REVISION DETAIL
  https://phabricator.kde.org/D23638

AFFECTED FILES
  CMakeLists.txt

To: wbauer, #rocs
Cc: kde-edu, narvaez, apol
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