ssl_callback_TmpDH: for OpenSSL 1.0.2 and later, set the current cert to the
one actually used for the connection before calling SSL_get_privatekey(ssl)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1588851 13f79535-47bb-0310-9956-ffa450edef68