[Insight-developers] Change some CMake option names to reduce global CMake namespace pollution?

[Williams, Norman K]

Right now there are 4 variables -- specific to ITK -- that begin with USE
instead of ITK:


USE_FFTWD
USE_FFTWF
USE_SYSTEM_FFTW
USE_WRAP_ITK

Shouldn't these all be changed to, e.g.

ITK_USE_FFTWD
ITK_USE_FFTWF
ITK_USE_SYSTEM_FFTW
ITK_USE_WRAP_ITK



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