mod_ssl namespacing: Merge SSL_X509_INFO_load_path() into its only caller

ssl_init_proxy_certs() in ssl_engine_init.c. No functional change.
Review by: kbrand


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1677830 13f79535-47bb-0310-9956-ffa450edef68