[C++] Neon not enabled on Windows ARM64
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Component: C++
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
It seems that, currently, Neon is not enabled at all on Windows ARM64 builds:
https://github.com/apache/arrow/actions/runs/25043252865/job/73351674163?pr=49756#step:11:377
The reason was lack of xsimd support. However, xsimd [now supports](https://github.com/xtensor-stack/xsimd/commit/1c6c7f0ac578c9aea1d8d08afce7d8ee9587491f) Windows ARM64 on its main branch.
So we can probably re-enable Neon on Windows once a new xsimd version is released.
### Component(s)
C++
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