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

[Xavier de Gaye]

Xavier de Gaye added the comment:

>> this assumption is wrong for the multiarch case.
>
> Please explain why it is wrong.

Sadly no explanations have been given, we have to take Matthias word for it.
This new patch updates the add_multiarch_paths() method and includes LIBDIR and INCLUDEDIR in their corresponding search paths for the multiarch case.

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assignee: xdegaye -> 
stage: commit review -> patch review
Added file: http://bugs.python.org/file45893/multiarch.patch

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