dlib neon support flag on Nvidia tx2 board

dlib neon support flag on Nvidia tx2 board



The arm structure of tx2 board is AArch64 supporting neon natively, no need to specify -mfpu=neon.



But in dlib simd code, there are switches like #ifdef DLIB_HAVE_SSE2, #elif defined(DLIB_HAVE_NEON), else(non-sse, non-neon).



I did profiling for some dlib functions, it didn't affect the time whether or not I define MACRO DLIB_HAVE_NEON? While it should be faster if I use DLIB_HAVE_NEON branch then else branch.




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