[issue5120] Disabling test_ttk_guionly on mac

[Ned Deily]

Ned Deily <nad at acm.org> added the comment:

I noticed this while investigating Issue6834. Is this still an open issue 
for OS X?  Could it explain the symptoms in 6834?

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nosy: +ned.deily, ronaldoussoren

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5120>
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