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

[STINNER Victor]

STINNER Victor added the comment:

Updated patch, version 6:

* Rename "obj" variable to "iter"
* Fix unpack_from() signature: only the first parameter is positional only

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Added file: http://bugs.python.org/file46436/struct_fastcall-6.patch

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