* modules/metadata/mod_headers.c: Add a function pointer type for

  the tag handler callback to regain some type-safety.
  (register_format_tag_handler, header_pre_config): Adjusted.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@946173 13f79535-47bb-0310-9956-ffa450edef68