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We don't use it any more, and it shouldn't be used as it effectively
means that the test won't work in the parallel testsuite.

(for the same reason we already omit threaded1 and threaded2)

We used to skip it because of trac #1198, but that is now fixed

This test is very fragile, and updating it is fiddly due to the
auto-generation, so skip it when fast (and thus when validating).