fix the problem where a scoreboard init failure could leave

mod_cgid stranded

a pre_mpm hook can now return failures, so problems in
ap_create_scoreboard percolate back to a place where Apache
can exit cleanly


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93055 13f79535-47bb-0310-9956-ffa450edef68