D20807: add support for extra cmake finders

[Harald Sitter]

sitter added a dependent revision: D20811: replace manual fftw3 lookup with pkg-config-assisted finder.

REPOSITORY
  R262 LabPlot

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

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