Fix some symbols which should -not- be exported, and decorate real_exit_code
  with ap_ (this symbol must be exported.)  If the others were desired to be
  public, they should have been ap_xxx decorated.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@154216 13f79535-47bb-0310-9956-ffa450edef68