Seg3D
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Fix FFT library build on Windows
Needed for mosaic tools.
Since we are using Windows and Visual Studio, we have to install fftw and use ITK_USE_SYSTEM_FFTW.
https://github.com/CIBC-Internal/itk/blob/6f7b1014a73857115d6da738583492008bea8205/CMake/itkExternal_FFTW.cmake#L61