Provide an accessor function for the global_score portion of the scoreboard.

Submitted by:	Harrie Hazewinkel <harrie@covalent.net>
Reviewed by:	Aaron Bannert


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92377 13f79535-47bb-0310-9956-ffa450edef68