change Apache/apr/apr-util to use run-time linking on AIX

currently, a kludge (-uXML_Parse) is needed to get a reference to expat
in the Apache executable programs; I think this is related to the fact
that expat libtool is getting generated a little differently than apr
libtool and is choosing to build a different flavor of shared library


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92435 13f79535-47bb-0310-9956-ffa450edef68