fix problem with __m128i undefined on ARM #224
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There is a constant REG_SZ, see file modification, that is used conditionally only when SSE2 is defined but the variable REG_SZ is defined unconditionally.
This problem cause the compilation to fail on ARM64 architecture.
I added ifdef guards based on SSE2 like for the rest of the code. It compiles on macOS on ARM64 architecture.