set FFT_NATIVE flag if armadillo is not used
set FFT_NATIVE flag if armadillo is not used

AlexanderViand/HElib,AlexanderViand/HElib,shaih/HElib,berserkr/HElib,berserkr/HElib,shaih/HElib,AlexanderViand/HElib,berserkr/HElib,shaih/HElib