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

[Harald Sitter]

sitter created this revision.
Herald added a project: KDE Edu.
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REVISION SUMMARY
  more reliable and shows up in feature summary this way

TEST PLAN
  still builds

REPOSITORY
  R262 LabPlot

BRANCH
  fftw3

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

AFFECTED FILES
  CMakeLists.txt
  cmake/FindFFTW3.cmake
  src/CMakeLists.txt
  tests/analysis/convolution/CMakeLists.txt
  tests/analysis/correlation/CMakeLists.txt
  tests/import_export/ASCII/CMakeLists.txt
  tests/import_export/JSON/CMakeLists.txt
  tests/import_export/MQTT/CMakeLists.txt
  tests/import_export/project/CMakeLists.txt
  tests/nsl/dft/CMakeLists.txt

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