message: CMake: Tests now include the correct FFT headers,
  previously only the kissFFT headers were included, even if cufft or FFTW were used.
diff: @@ -449,7 +449,7 @@ if( SPIRIT_BUILD_FOR_CXX OR SPIRIT_BUILD_FOR_JS )
  target_include_directories( ${testName} PRIVATE
  ${PROJECT_SOURCE_DIR}/test
  ${CMAKE_CURRENT_LIST_DIR}/thirdparty
  - ${CMAKE_CURRENT_LIST_DIR}/thirdparty/kiss_fft )
  + ${FFT_INCLUDE_DIRS} )
  # Apply public compile definitions from the object library
  target_compile_definitions( ${testName} PRIVATE
  $<TARGET_PROPERTY:${META_PROJECT_NAME},INTERFACE_COMPILE_DEFINITIONS> )
  