bootstrap/rusts: Don't check after all

It wastes about 10-15 minutes per build.  The tests will fail virtually
everywhere until the late 70s (~76 for x86_64, ~78 for ppc64) anyway.

I had originally thought it would be good to have a list of the
failures present in logs in case we had other failures, but if we do we
can always run them ourselves.  No reason to waste hours of machine time
for test results we throw away anyway.

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