[issue46323] Use _PyObject_Vectorcall in Modules/_ctypes/callbacks.c

[hydroflask]

hydroflask <hydroflask at yqxmail.com> added the comment:

Vanilla bench_callback_v2.py, not compiled with mypyc:

    $ env/bin/python bench_callback_v2.py
    1.114047016017139
    $ env2/bin/python bench_callback_v2.py
    0.9644024870358407

~13% reduction in runtime. Nice job!

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<https://bugs.python.org/issue46323>
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