pgsql: Cope with circularities involving a view's ON SELECT rule.

Log Message:
-----------
Cope with circularities involving a view's ON SELECT rule.  I originally
thought there couldn't be any, but the folly of this was exposed by an
example from andrew@supernews.com 5-Dec-2004.  The patch applies the
identical logic already used for table constraints and defaults to ON
SELECT rules, so I have reasonable confidence in it even though it might
look like complicated logic.

Modified Files:
--------------
    pgsql/src/bin/pg_dump:
        pg_dump.c (r1.395 -> r1.396)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dump.c.diff?r1=1.395&r2=1.396)
        pg_dump.h (r1.113 -> r1.114)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dump.h.diff?r1=1.113&r2=1.114)
        pg_dump_sort.c (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dump_sort.c.diff?r1=1.6&r2=1.7)