End apr_natstrcasecmp, backporting part of r216111 (there may remain
  other apr_natstrcasecmp abuse in other files).

  Still unsure if apr_strnatcasecmp of the hostname is deliberate to
  handle leading 0's in ip addresses, so leaving that single use case.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/proxy-reqbody-2.0.x@230708 13f79535-47bb-0310-9956-ffa450edef68