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This PR makes primal available on no_std targets by adding no-std feature.
I have checked this builds on thumbv7em-none-eabihf.
I ran cargo bench before and after those changes and found no difference in performance (tested on x86_64-linux-gnu).
Without the no-std feature enabled the crate still builds on the MSRV (1.36).
One issue I found is the hamming dependency - no_std support was added there 5 years ago, but the newest version on crates.io is from 8 years ago.