D20807: add support for extra cmake finders

[Harald Sitter]

sitter created this revision.
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REVISION SUMMARY
  this allows us to find dependencies as proper packages rather than
  simulate packages and in turn bypass cmake's feature summary and rendering
  the dependencies listed in a non-standard fashion

TEST PLAN
  still configures

REPOSITORY
  R262 LabPlot

BRANCH
  master

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

AFFECTED FILES
  CMakeLists.txt

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