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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Oh by the way, I forgot to mention a subtle change.
> PyObject_GetBuffer(PyBUF_SIMPLE) is less strict that PyArg_Parse("y#") /
> "buffer" converter of Argument Clinic: getargs.c also checks that the
> buffer is contiguous, extract of getbuffer():

We already made such changes in the past. The difference is subtle and I have 
doubts that choosing any of ways was deliberate.

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