ENH: ITKFFT library is now required, even if cufft is used.

With the enum streaming for itkComplexToComplexImageFilter implemented
in a .cxx file, the ITKFFT library is now required, even if cufftw
is used.

Author: aylward

Modules/Filtering/FFT/CMakeLists.txt

@@ -1,7 +1,7 @@
 project(ITKFFT)
 
 if(ITK_USE_CUFFTW)
-  set(ITKFFT_LIBRARIES ${FFTWF_LIB})
+  set(ITKFFT_LIBRARIES ITKFFT ${FFTWF_LIB})
 else()
   set(ITKFFT_LIBRARIES ITKFFT)
 endif()