Add Jeffrey W. Baker proposed ap_unparse_uri_components() rewrite

for possible inclusion in 1.3.18. At present, I think we should
investigate it, with the knowledge that including it will most
likely push out the release. It's a big change. But I'm not
ready to -1 it for 1.3.18 at present.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@88192 13f79535-47bb-0310-9956-ffa450edef68