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I should have noted in this item when I checked in rev 51133
that it included the essence of this patch (skipping the
thread stack size testing on platfforms that don't support
the feature) within the existing test framework.  Thus 2.5b3
should correctly handle this situation - if it doesn't,
please say so.

I understood that it was too late in the 2.5 release process
to admit a rewrite and so was waiting for the release to
branch before bringing the patch into the trunk.