Testsuite change: CLEANUP=1 is now the default

[Thomas Miedema]

Hello devs,

by popular request (#9758), the testsuite will now clean up after itself
after running the tests, removing generated files, saving you some 10G of
diskspace in the worst case. If you want the old behavior back, you can do:

```
$ make test CLEANUP=0
```

I updated
https://ghc.haskell.org/trac/ghc/wiki/Building/RunningTests/Running.

The cleaning itself is not perfect at the moment; some temporary files are
not deleted. I have a solution for this in
https://ghc.haskell.org/trac/ghc/ticket/11980 and
https://phabricator.haskell.org/D1187. More about that later.

Cheers,
Thomas
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