[issue15402] Correct __sizeof__ support for struct

[Meador Inge]

Meador Inge <meadori at gmail.com> added the comment:

While looking this up in the C Standard (ISO/IEC 9899:TC3) I also noticed 6.3.2.3p8:

"""
A pointer to a function of one type may be converted to a pointer to a function of another
type and back again; the result shall compare equal to the original pointer. If a converted
pointer is used to call a function whose type is not compatible with the pointed-to type, the behavior is undefined.
"""

I will add the 'unused' parameter back with my refresh patch.

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<http://bugs.python.org/issue15402>
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