Permit unbundling the library about liboqs-rust HOT 7 CLOSED

This should be possible by letting oqs-sys' build.rs find liboqs and its header files. We should probably do a vendor style feature like the openssl-sys crate.

However, I do not have time to make the required changes to do this right now. I would review and potentially merge a PR, but it would also need to expand CI to cover these new build scenarios.

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Thank you. Unfortunately I do not have any Rust experience, so I'll not be able to assist you with this.

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I took a quick glance at this out of curiosity, but liboqs doesn't seem to provide a pkg-config file, and cmake scripts alone aren't easily read from build.rs :/

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Now that @tranzystorek-io provided open-quantum-safe/liboqs#1435 which was merged (thank you!!!), I think the discussion should continue here. @thomwiggers are there any specific requirements for such a PR? So far I only got

• has to be checked by CI

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This should be fixed by #190 right?

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@thomwiggers This here is issue #190, so I'm not sure what you meant to link.

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My bad, #211

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