Add the AP_DECLARE()/AP_CORE_DECLARE macros on the return types of

functions used by mod_proxy for export in DLL
Submitted by:	Ian Holsman <IanH@cnet.com>
Reviewed by:	Chuck murcko


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89078 13f79535-47bb-0310-9956-ffa450edef68