Merge r1769592 from trunk.

* modules/ssl/ssl_engine_vars.c (ssl_var_lookup_ssl_cert): Use const
  ASN1_OBJECT for X509_ALGOR_get0() for OpenSSL >= 1.1.0 per
  https://github.com/openssl/openssl/commit/ac4e257747075958d37665f327bdf685dd2478ab



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x-openssl-1.1.0-compat@1769594 13f79535-47bb-0310-9956-ffa450edef68