Do not allow an ON clause to references tables to its right if there is a

Do not allow an ON clause to references tables to its right if there is a
RIGHT or LEFT join anywhere in the query.  Other RDBMSes prohibit this always,
but SQLite must allow ON clauses to reference tables to their right for legacy
compatibility, unless there is a RIGHT or LEFT join someplace in the query,
in which case there is no legacy to support.

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