src: remove TLS code for unsupported OpenSSLs

Versions of OpenSSL lower than 1.1.1 are no longer supported, so remove
ifdefs for previous versions.

PR-URL: https://github.com/nodejs/node/pull/28085


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>