Add ARM NEON SIMD path for Win-ARM64 / AArch64#66
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Xerces-C has had an SSE2-accelerated fast path inside
CMStateSet. On Windows-on-ARM64 and AArch64 Linux that path silently fell back to the scalar loop because the SSE2 macros were never defined. This PR adds a parallel ARM NEON code path so those targets get the same SIMD speedup the x86/x64 builds already enjoy.