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

[STINNER Victor]

STINNER Victor added the comment:

Thank you for your reviews Serhiy :-) Here is a new patch to take in account your latest comments.

I didn't change the API anymore: Struct.unpack_from() accepts keywords, unpack_from() doesn't.

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Added file: http://bugs.python.org/file46432/struct_fastcall-4.patch

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