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Syoyo Fujita d31c16e333 CI: fix clang -Werror on unknown flag and MSVC fopen warning
run 25611531122 surfaced two failures:

- Stock Ubuntu clang errored on `-Wno-pre-c11-compat` (added in newer
  clang). Add `-Wno-unknown-warning-option` so older clang silently
  ignores warning flags it doesn't know.

- MSVC /W4 /WX failed on C4996 (fopen deprecation). Define
  `_CRT_SECURE_NO_WARNINGS` for the v3 C MSVC build; the parser uses
  fopen by design and v1 already takes the same approach.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-10 06:00:09 +09:00
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