[issue10615] Trivial mingw compile fixes

[Roumen Petrov]

Roumen Petrov added the comment:

This patch cannot be closed as contain some fixes not reported/proposed yet .  
For instance I'm not aware of name clash in Modules/_pickle.c .
I think that other are in scope of issue3871 or earlier .

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<http://bugs.python.org/issue10615>
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