Issue #9850: Fixed macpath.join() for empty first component.  Patch by
Oleg Oshmyan.

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branch : 2.7
Issue #16537: Check whether self.extensions is empty in setup.py.

Patch by Jonathan Hosmer.

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branch : 2.7
#10510: make distuitls upload/register use HTML standards compliant CRLF.

Patch by Ian Cordasco, approved by Éric Araujo.

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branch : 2.7