PR 57379: If mod_cgi and mod_cgid get installed,

use IfModule for MPM to choose mod_cgi for
prefork and mod_cgid in all other cases.

Previously when combined with --enable-load-all-modules
both modules were loaded and it was undefined
which one actually handled cgi requests.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1652955 13f79535-47bb-0310-9956-ffa450edef68