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

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

I suggest to go ahead and apply this patch, at least it correctly selects "printable" characters, whatever this means.
I filed issue9198 to decide whether chr(0x10000) should be printable.

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<http://bugs.python.org/issue5127>
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