[issue37055] Numerous warnings with blake2 module

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

Although OpenSSL comes with blake2, it does not support any of the advanced features like keying, personalization, or tree hashing. See https://github.com/openssl/openssl/issues/980

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<https://bugs.python.org/issue37055>
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