Avoid doing a get_module_config if none of the RLIMITs are defined,

since we don't need it if we are not going to do a setrlimit.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78030 13f79535-47bb-0310-9956-ffa450edef68