PostgreSQL patch: Where clause not built properly with some foreign joins

This is a patch against 3.6.1 and fixes this issue:

http://lists.b9.com/pipermail/clsql-help/2006-June/000633.html

It took me several hours to figure it out, lest you think it's a  
joke. Thanks to Flektor, Inc. for sponsoring this fix as well as the  
system views/tables one.

Fix tested by running the CLSQL test harness.

sql/oodml.lisp
986c986
<       #+nil(when where
---
 >       (when where

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