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Adjust tuplesort.c based on the fact that we never use the OS's qsort().
Our own qsort_arg() implementation doesn't have the defect previouslyobserved to affect only QNX 4, so it seems sufficiently to assert thatit isn't broken rather than retesting. Also, update a few comments toclarify why it's valuable to retain a tie-break rule based on CTIDduring index builds.Peter Geoghegan, with slight tweaks by me.