Raise the vectorization #if to NDK r31

[emrekultursay]

It seems vectorization is still not there in r30.

[gemini-code-assist]

Summary of Changes

Hello @emrekultursay, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request adjusts a conditional compilation directive within the benchmark.cpp file, specifically raising the required NDK major version for a std::simd feature check. The modification reflects the current status where std::simd is not yet fully implemented or stable in NDK r30, thus postponing the associated compilation error to NDK r31.

Highlights

• NDK Version Update: The conditional compilation check for std::simd support has been updated from __NDK_MAJOR__ >= 29 to __NDK_MAJOR__ >= 31.
• Vectorization Support: This change indicates that std::simd is still not fully supported or available in NDK r30, necessitating the deferral of the check to a later NDK version.

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[gemini-code-assist]

Code Review

This pull request updates the NDK version check for std::simd from version 29 to 31. The change correctly reflects the information in the PR description that this feature is not yet available in NDK r30. My only suggestion is to update the PR title to mention 'NDK r31' instead of 'NDK r30' to avoid confusion and maintain a clear commit history.