[issue29259] Add tp_fastcall to PyTypeObject: support FASTCALL calling convention for all callable objects

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

PyArg_UnpackStack() is declared as in the limited API since 3.3. If you want to add PyArg_UnpackStack() to the limited API, define it as added in 3.7.

For compatibility with extensions built with older Pythons you should define new type flag and read tp_fastcall only if the flag is set. See for example Py_TPFLAGS_HAVE_FINALIZE.

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<http://bugs.python.org/issue29259>
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