Don't skip tests which are supposed to fail; mark them as xfail #15472
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Especially regarding buggy server behavior, we should not skip those tests, because it is unlikely that fixes to the server's behavior will even be noticed. Instead we mark these tests as xfail, so we get a warning if the test succeeds, and can act appropriately.
Note that mysqli_stmt_attr_get_prefetch.phpt passes for me with MySQL 5.6, 8.0 and 9.0.