[issue21842] Fix IDLE in unicodeless build

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Most tests which detects no-unicode build, assume that the unicode doesn't exist. It can be confused to introduce faked public (non-underscored) name.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21842>
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