Bump Externals/sse2neon from `270cf6e` to `5e4d3e7`

Created by: dependabot[bot]

Bumps Externals/sse2neon from 270cf6e to 5e4d3e7.

Commits

• 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
• 8f62ae7 tests: Simplify the test items with X macro
• ae6fe13 Fix build with gcc
• f64a605 Implement _mm_cmpistr intrinsics (#555)
• 364bd96 Mention Winter as a new adoption case
• Additional commits viewable in compare view

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