Support for building library-based modules (mod_proxy) as shared objects and

support for the situation where all modules of a modules/ subdir are build as
shared objects (mod_example).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80498 13f79535-47bb-0310-9956-ffa450edef68