Add Dynamic Shared Object (DSO) support for SCO5 (OpenServer 5.0.x).

Submitted by: Ronald Record <rr@sco.com>
Reviewed by: Ralf S. Engelschall
PR: 2533


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@81659 13f79535-47bb-0310-9956-ffa450edef68