[issue19529] Fix unicode_aswidechar() with 4byte unicode and 2byte wchar_t, for AIX

[Georg Brandl]

Georg Brandl added the comment:

Looks obvious and is potentially a security fix, so it can/should go in.  Please add a NEWS entry.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19529>
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