[issue15402] Correct __sizeof__ support for struct

[Meador Inge]

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

The attached patch fixes: (1) the test cases to make them exact (inspired by 'test_sys.py'), (2) the definition of 's_sizeof' to add the dummy parameter, and (3) simplifies the sizeof calculation using 's_len'.

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Added file: http://bugs.python.org/file26520/issue15402-redux-v1.patch

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