openssl: add SSL::SSLContext#security_level{=,}

* ext/openssl/extconf.rb: Check for SSL_CTX_get_security_level().
  OpenSSL 1.1.0 introduced "security level".
  [ruby-core:75225] [Feature #12324]

* ext/openssl/ossl_ssl.c (ossl_sslctx_{get,set}_security_level): Add
  SSLContext#security_level and #security_level=.

* test/openssl/test_ssl.rb (test_security_level): Add test. ...but this
  doesn't actually test it. Because #security_level= is necessary in
  order to run other tests on OpenSSL 1.1.0, go without tests for now.
  Will fix after converting SSLContext#key= and #cert= to normal methods.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55309 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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