[GHC] #9758: By default, testsuite should clean up after successful tests

[GHC]

#9758: By default, testsuite should clean up after successful tests
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        Reporter:  ezyang            |                Owner:
            Type:  task              |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Test Suite        |              Version:  7.9
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 I often run `make test` in the `testsuite/tests` directory itself, and
 this this bytes.

 I suggest to simply make `CLEANUP=1` the default, and if someone needs to
 build an individual test _and keep the output_ (which I expect is the
 exception), then have him say `CLEANUP=0` explicitly.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9758#comment:2>
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