[m-rev.] diff: private_builtin should not import io, step 2

[Zoltan Somogyi]

The diff itself is straightforward, and the concept has already
been reviewed, so there is no need for a review. However,
I cannot commit this until everyone has installed a compiler
which includes step 1, which was committed yesterday morning.

Can people please email me when they have done so?
I intend to wait until I have got confirmation from at least Julien,
Paul, and Peter; email me also if you want to add your name
to the list.

Zoltan.
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