Fix pg_dump to dump casts between auto-generated types.

The heuristic for when to dump a cast failed for a cast between table
rowtypes, as reported by Frédéric Rejol.  Fix it by setting
the "dump" flag for such a type the same way as the flag is set for the
underlying table or base type.  This won't result in the auto-generated
type appearing in the output, since setting its objType to DO_DUMMY_TYPE
unconditionally suppresses that.  But it will result in dumpCast doing what
was intended.

Back-patch to 8.3.  The 8.2 code is rather different in this area, and it
doesn't seem worth any risk to fix a corner case that nobody has stumbled
on before.

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