crypto: deprecate {ecdhCurve: false}

This doesn't work in OpenSSL 1.1.0.  Per discussion on the PR, it is
preferable to just deprecate this setting. Deprecate it and skip the
test in OpenSSL 1.1.0.

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


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