Remove private _PyUnicode_AsString() alias to :c:func:`PyUnicode_AsUTF8`. It was kept for backward compatibility with Python 3.0 - 3.2. The :c:func:`PyUnicode_AsUTF8` is available since Python 3.3. The :c:func:`PyUnicode_AsUTF8String` function can be used to keep compatibility with Python 3.2 and older. Patch by Victor Stinner.