httpd compiles warning free on gcc and every new warning will be treated as an...

httpd compiles warning free on gcc and every new warning will be treated as an error, standard c-89 is enforced

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1702948 13f79535-47bb-0310-9956-ffa450edef68