OpenSSL 1.1.0 compat:

- Avoid use of deprecated functions for OpenSSL version >= 1.0

Backport of r1421305 from trunk.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x-openssl-1.1.0-compat@1756049 13f79535-47bb-0310-9956-ffa450edef68