Use the value of the Apache serveroot key in the registry, if it exists,

in preference to the compiled in default. Any -d command line flag
will override the registry value. Apache -i sets the serverroot key
in the registry.

Reviewed by:  (concept only) Martin Kraemer, Jim Jagielski, Ken Coar


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80309 13f79535-47bb-0310-9956-ffa450edef68