Add typecast to removing a compiler warning on systems that consider

mode_t and %o different.

PR:
Obtained from:
Submitted by:
Reviewed by:	Roy T. Fielding, Jim Jagielski, Dirk-Willem van Gulik


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79614 13f79535-47bb-0310-9956-ffa450edef68