pgsql: Don't add a shared dependency on the owner of a composite type in

Log Message:
-----------
Don't add a shared dependency on the owner of a composite type in pg_class.
We track the owner in pg_type instead, as that is the place where the owner is
changed on ALTER TYPE ... OWNER TO.

Modified Files:
--------------
    pgsql/src/backend/catalog:
        heap.c (r1.295 -> r1.296)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/heap.c.diff?r1=1.295&r2=1.296)