D20811: replace manual fftw3 lookup with pkg-config-assisted finder

[Aleix Pol Gonzalez]

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


  LGTM

REPOSITORY
  R262 LabPlot

BRANCH
  fftw3

REVISION DETAIL
  https://phabricator.kde.org/D20811

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