Support for OpenSSL 1.1.0

- Simplify code by using new 1.1.0 variant
  also for older OpenSSL. Also tested with
  1.0.2f and 0.9.8zh. No ssl test suite
  failures.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1731423 13f79535-47bb-0310-9956-ffa450edef68