[issue28542] document cross compilation

[Martin Panter]

Martin Panter added the comment:

Actually I think it is good to document DESTDIR (you weren’t seem aware of it before?). I was just pointing out that it is useful to more than just Android. Perhaps Guido shouldn’t have trimmed it from the 2.7 readme (original text: https://hg.python.org/cpython/diff/988b3e807043/README). On the other hand, --prefix etc are already mentioned in “./configure --help”, and more people already seem to know about it.

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<http://bugs.python.org/issue28542>
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