openssl: Access to ephemeral TLS session key
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54485 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
openssl: Access to ephemeral TLS session key
TLS session key in case of forward secrecy cipher. Only
available since OpenSSL 1.0.2. [Fix GH-1318]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54485 b2dd03c8-39d4-4d8f-98ff-823fe69b080e