[issue29300] Modify the _struct module to use FASTCALL and Argument Clinic

[STINNER Victor]

STINNER Victor added the comment:

> It looks to me that the type of the self parameter can be changed from PyObject* to PyStructObject*. This will make the patch larger but the final code simpler.

I like the idea, but I prefer to do in a separated change, once the first big one is merged. Otherwise, the first patch will do too many unrelated things at the same time IMHO.

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<http://bugs.python.org/issue29300>
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