Be more aggressive when doing a "make clean". Deals with error reports like

PR#752.

Reviewed by:	Marc, Randy, Jim
Submitted by:
Obtained from:


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78329 13f79535-47bb-0310-9956-ffa450edef68