No longer assume SERVER_CONFIG_FILE is in the "conf" directory. Instead

look for it in the $sysconfdir.

This required the use of a new m4 function from APR that retrieves
the fully "expanded", or recursively interpolated, value of the
$sysconfdir variable.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93622 13f79535-47bb-0310-9956-ffa450edef68