lang/python311: add LibreSSL support

LibreSSL 3.6 and later are fully compatible with PEP-644 for the
ssl and hmac modules, but not hashlib due to missing SHA-3/SHAKE,
BLAKE2 and scrypt. Partially reverts
https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e
for _hashopenssl.c only and void the configure check so that hashlib
builds on LibreSSL.