dangernoodle-io / breadboard / 26141615591

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fix(bb_event): define _GNU_SOURCE on host so PTHREAD_MUTEX_RECURSIVE resolves (#282)

`platform/host/bb_event/bb_event_host.c` calls
`pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE)`, but glibc
gates both the function prototype and the recursive-mutex constant
behind `_GNU_SOURCE` (or `_XOPEN_SOURCE >= 500`). macOS / BSD libc
expose them unconditionally, so local builds passed and CI was the
first to surface it — once a downstream consumer (TaipanMiner's
per-pool stats work) pulled `bb_event` into the host build, GitHub
Actions Ubuntu refused to compile the file.

Define `_GNU_SOURCE 1` at the very top of the file, before any include,
so `<features.h>` sees it on first latch.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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