failtest now culls duplicates for itself (and more efficiently), so
don't replicate the logic here. It changes things a bit, because
failtest uses backtraces rather than a simple call point to find
duplicates.
Also, fix one case (in run-11-simple-fetch.c) where we simply exited
rather than using failtest_exit(). We got away with it before, because
we never hit that particular failure pattern.