D20807: add support for extra cmake finders

[Aleix Pol Gonzalez]

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

REPOSITORY
  R262 LabPlot

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20807

To: sitter, apol
Cc: kde-edu, narvaez, apol
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