[issue1887] Document that distutils doesn't support out-of-source builds

[Éric Araujo]

Éric Araujo added the comment:

Thanks for the patch.  I did a review, you should have got an email; if not, follow the “review” link on the right of your patch in the list of files near the top of this page.

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components: +Documentation
versions: +Python 3.5 -Python 3.3

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