Move ARM_NEON definition and fix possible double define #3735
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It should not have been set in platform.h (inside the cpuid function!) in the first place. And apparently, though this was ok for Windows ARM, on Mac ARM it's an error because that symbol is already defined. So only redefine it if it's currently undefined. And move the whole check and definition into simd.h where all the other ARM_NEON stuff lives.