Dynamic Shared Object (DSO) support for OpenBSD 2.x

BTW: The cool thing about this is that this was possible through
     the nifty Perl-fallback feature in src/Configure we recently
     introduced especially for this situation: Platforms were
     we do not have access and need feedback from the users ;-)

PR: 2109


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@81015 13f79535-47bb-0310-9956-ffa450edef68