[Cython] Skip tuple unpacking for func(*args, **kwargs)

[Stefan Behnel]

Hi,

here is another optimisation that removes argument unpacking for the
star-args-only case(s). This means that pass-through functions or wrappers
that do argument handling themselves or just pass it on to a wrapped function
will now run almost without internal overhead.

The generated code looks like this:

--------------------------------
  Py_INCREF(__pyx_args);
  __pyx_v_a = __pyx_args; __pyx_args = 0;
  if (__pyx_kwds) {
    Py_INCREF(__pyx_kwds);
    __pyx_v_k = __pyx_kwds; __pyx_kwds = 0;
  }
  else {
    __pyx_v_k = PyDict_New();
  }
--------------------------------

plus straight sanity checks when you use only one out of *args -or- **kwargs.

Note that I'm actually setting __pyx_args/kwds to 0 here, to make sure we
notice programming errors.

Stefan
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