Cleanup CMake for FFTW using PkgConfig
The FindFFTW3.cmake
helper file has been removed and PkgConfig
is used instead. This solution is based on https://stackoverflow.com/a/68220409/2528536.
The CMake assumes either FFTW, or MKL. The MKL part will be cleaned up in a follow-up MR.
Edited by Bram Veenboer