The query flattener should not run if the subquery is a compound that contains

The query flattener should not run if the subquery is a compound that contains
a RIGHT JOIN in any arm and the subquery is not the first element of the
outer query.  Otherwise, prior elements of the outer query will not have
the JT_LTORJ flag set.  Fix for the problem reported in
[forum:/forumpost/174afeae5734d42d|forum post 174afeae5734d42d].

FossilOrigin-Name: cf9ed7f2e1a7be230a8ff689a759289a6bf59c1c84169f2ed510f74c02e0c2e0