crypto: remove locking callbacks for OpenSSL 1.1.0

The callbacks are all no-ops in OpenSSL 1.1.0. This isn't necessary (the
functions still exist for compatibility), but silences some warnings and
avoids allocating a few unused mutexes.

PR-URL: https://github.com/nodejs/node/pull/16130


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Rod Vagg <rod@vagg.org>