pgsql: Make pg_dump --oids work when default_with_oids = off.

Log Message:
-----------
Make pg_dump --oids work when default_with_oids = off. Per report from
Michael Fuhr.

Modified Files:
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pgsql/src/bin/pg_dump:
pg_dump.c (r1.397 -> r1.398)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dump.c.diff?r1=1.397&r2=1.398)