OpenSSL 1.1.0 support

- no need to check for opaque "valid" cert
  flag, since we get here only if internal
  certificate verification of OpenSSL returned
  ok=1.

Backport of r1729500 from trunk.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x-openssl-1.1.0-compat@1755825 13f79535-47bb-0310-9956-ffa450edef68