Change from char array to c_str() function to resolve compilation error with MSVC++ compiler where runtime array size isn't allowed.  I have fuzzy memory of a bug when passing std::string::c_str() to PyObject_GetAttrString(...), so might end up having to find another solution.
Change from char array to c_str() function to resolve compilation error with MSVC++ compiler where runtime array size isn't allowed.  I have fuzzy memory of a bug when passing std::string::c_str() to PyObject_GetAttrString(...), so might end up having to find another solution.

git-svn-id: dcef21d3ff4cbd8dced82702dcaad637bf246ecc@1577 aa0779c3-6ec2-4b84-a212-a405c134cd8d

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