With OpenSSL 1.0.2 or later, enable OCSP stapling in a loop based on
SSL_CTX_set_current_cert(), near the end of ssl_init_server_ctx.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1564760 13f79535-47bb-0310-9956-ffa450edef68