PORT: Add Dynamic Shared Object (DSO) support for BSDI (v4.0).

Submitted by: Tom Serkowski <tks@bsdi.com>
PR: 3453


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@82453 13f79535-47bb-0310-9956-ffa450edef68