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Implement confstr (unistd.h)

Josh Megnauth requested to merge josh/relibc:add-confstr into master

For Fish. Musl's source amusingly calls this function entirely useless. 😹

I also switched an #[unsafe(no_mangle)] from my last patch back to a #[no_mangle] because we need to bump cbindgen. #[unsafe(no_mangle)] is required for Rust 2024. I'm not sure why it builds in CI and locally though.

The implementation for confstr is straightforward. Most of the constants return 0 on both musl and glibc. The only constant that doesn't is required for Fish.

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