D20809: replace manual cerf lookup with pkg-config-assisted finder

[Harald Sitter]

sitter created this revision.
Herald added a project: KDE Edu.
Herald added a subscriber: kde-edu.
sitter requested review of this revision.

REVISION SUMMARY
  more reliable and shows up in feature summary this way

TEST PLAN
  still builds

REPOSITORY
  R262 LabPlot

BRANCH
  cerf

REVISION DETAIL
  https://phabricator.kde.org/D20809

AFFECTED FILES
  CMakeLists.txt
  cmake/FindLIBCERF.cmake

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