cipher-chachapoly: use OpenSSL's implementation of Poly1305 #560
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OpenSSL starting in version 3.0.0 has a new EVP_MAC API which allows POLY1305 algorithm to be used as a standalone MAC. OpenSSL's implementation is significantly faster, so we should use it when it's available.
With this change on an Intel N100 (Alderlake-N), I observed a 26% speedup for the entire chacha20-poly1305@openssh.com cipher from 276MB/s to 350MB/s.