pg_dump: Remove obsolete trigger support
Remove for dumping triggers from pre-9.2 servers. This should have
been removed as part of
30e7c175b81.
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/
56c8f5bf-de47-48c1-a592-
588fb526e9e6%40eisentraut.org