Bump Externals/sse2neon from `270cf6e` to `5b6ee3e`

Created by: dependabot[bot]

Bumps Externals/sse2neon from 270cf6e to 5b6ee3e.

Commits

• 5b6ee3e Mention Vowpal Wabbit as a new adoption case
• 9d1a13f Mention libstreamvbyte as a new adoption case
• 3eac8a4 Merge pull request #556 from invertego/clang_windows
• 990541d Add clang/Windows build
• 5e4d3e7 tests: Fix return type of _mm_extract_epi64
• b3f9a56 Reimplement _mm_clflush
• c23b816 Attempt to compile the header with C-only mode
• 8c28b7c Implement _mm_lfence with memory barrier
• 5836fb4 Implement _mm_mfence and _mm_sfence with memory barrier
• e715d38 Improve contributor notice
• Additional commits viewable in compare view

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