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fix(bb_timer): scope _POSIX_C_SOURCE in host backend for strict -std=c99 consumers (#322)

- bb_timer_host.c uses clock_gettime(CLOCK_MONOTONIC) + nanosleep (POSIX) but relied on the consumer compiler default exposing them
- taipanminer native test env uses strict -std=c99 which hides POSIX -> CLOCK_MONOTONIC undeclared when it compiles the fetched host backend
- define _POSIX_C_SOURCE 200809L (guarded) before includes, scoped to this file so consumers need no global feature-test flag (a global -D broke unrelated snprintf visibility on macOS)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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