[Cython] Working on METH_FASTCALL and vectorcall support

[Jeroen Demeyer]

Hello,

this is just to let you know that I'm planning to add support for 
functions/methods defined with METH_FASTCALL instead of METH_VARARGS on 
CPython 3.7.

Once this is implemented, it will be fairly easy to use vectorcall (PEP 
590) for cython_function_or_method.


Jeroen.