starwing / piecetab / 31330518377

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fix: cov-show lcov 2.x syntax; snprintf via _DEFAULT_SOURCE not extern

lcov 2.x: --list rejects trailing --ignore-errors (must precede the
subcommand); capture needs --filter range for out-of-range lines.

macOS SDK maps snprintf to __builtin___snprintf_chk under some feature
macros, so a manual extern conflicts.  Test files use _DEFAULT_SOURCE
(glibc-only) instead; tests.h keeps no C99 declaration.

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