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Use futex-based locks and thread parker on {Free, Open, DragonFly}BSD.
This switches *BSD to our futex-based locks and thread parker.
Tracking issue: https://github.com/rust-lang/rust/issues/93740
This is a draft, because this still needs a new version of the `libc` crate to be published that includes https://github.com/rust-lang/libc/pull/2770.
r? `@Amanieu`