[issue20440] Use the Py_SETREF macro

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Following patch is manually crafted and covers the rest cases. It also replaces existing correct attribute replacing using a temporary variable with more compact call of the macro.

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Added file: http://bugs.python.org/file41402/py_setref_extra.patch

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<http://bugs.python.org/issue20440>
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