[issue20211] setup.py: do not add system header locations when cross compiling

[Roundup Robot]

Roundup Robot added the comment:

New changeset d1b400943483 by Xavier de Gaye in branch '3.6':
Issue #20211: Do not add the directory for installing C header files and
https://hg.python.org/cpython/rev/d1b400943483

New changeset fcc9f19fcc13 by Xavier de Gaye in branch 'default':
Issue #20211: Merge 3.6.
https://hg.python.org/cpython/rev/fcc9f19fcc13

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nosy: +python-dev

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<http://bugs.python.org/issue20211>
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