Avoid fd leaks by using pfopen/pfclose instead of fopen/fclose.

All the other uses of fopen/fclose, mostly for reading config files,
are okay.

Submitted by: Randy Terbush and Roy Fielding
Reviewed by: Dean Gaudet, Jim Jagielski, Marc Slemko, Chuck Murcko


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77585 13f79535-47bb-0310-9956-ffa450edef68