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

[Roundup Robot]

Roundup Robot added the comment:

New changeset faa1e4f4b156 by Victor Stinner in branch 'default':
Rename struct.unpack() 2nd parameter to "buffer"
https://hg.python.org/cpython/rev/faa1e4f4b156

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29300>
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