[issue24759] Idle: require tk 8.5 and ttk widgets, and drop unneeded code.

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I meant Tk 8.4, not Python 3.4.

Tests should be either passed or skipped, no errors raised.

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<http://bugs.python.org/issue24759>
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