Incorporate the ap_ldap incomplete API, as there is no interest or effort

at APR to make this a complete abstraction, and it was voted 'off the island'
with APR 2.0.  This will allow httpd 2.3 to build against either apr-2.0
or apr+util 1.x.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1129808 13f79535-47bb-0310-9956-ffa450edef68