openssl: auto-detect SSL_R_TLSV13_ALERT_CERTIFICATE_REQUIRED
#11617
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OpenSSL 1.1.1 defines this macro, but no ealier version, or any of the popular forks (yet). Use the macro itself to detect its presence, replacing the hard-wired fork-specific conditions.
This way the feature will enable automatically when forks implement it, while also shorter and possibly requiring less future maintenance.
Follow-up to 94241a9 #6721
Closes #11617