Add a missing 'Override' clause.

PR:		2582
Submitted by:	Andrew Gillespie <apache@FutureQuest.net>
Reviewed by:	Ken Coar


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@81701 13f79535-47bb-0310-9956-ffa450edef68