[issue17693] Use _PyUnicodeWriter API for CJK decoders

[Roundup Robot]

Roundup Robot added the comment:

New changeset d621bdaed7c3 by Victor Stinner in branch 'default':
Issue #17693: CJK encoders now use the new Unicode API (PEP 393)
http://hg.python.org/cpython/rev/d621bdaed7c3

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<http://bugs.python.org/issue17693>
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