Add backports of OpenSSL 3.0.0 fixes (upstream PR #6000)

Christian Heimesrequested to merge
tiran/centos_rpms_python-cryptography:bz1953446-ossl3 into c9s

PyCA cryptography 3.4.7 + patches for OpenSSL 3.0.0 support from PR https://github.com/pyca/cryptography/pull/6000

Fixes: rhbz#1953446

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