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gh-108724: Fix _PySemaphore compile error on WASM (gh-109583)

Some WASM platforms have POSIX semaphores, but not sem_timedwait.
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Sam Gross committed
9df6712c122b621dc5a1053ff1eccf0debfb2148
Parent: 0c89056
Committed by GitHub <noreply@github.com> on 9/19/2023, 5:35:11 PM