prefork MPM: Use the right permissions for the directory created

for gprof support.

Submitted by:         Jim Carlson <jcarlson@jnous.com>
Reviewed by:          Jeff Trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@99574 13f79535-47bb-0310-9956-ffa450edef68