[issue5127] Use Py_UCS4 instead of Py_UNICODE in unicodectype.c

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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superseder:  -> UCS4 build incorrectly translates cases for non-BMP code points

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5127>
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