[issue17883] Fix buildbot testing of Tkinter

[Zachary Ware]

Zachary Ware added the comment:

Jeremy, can you give me the output of a test run with issue17883-tmp-test.diff applied?  (Or just what a `python -m test -v test_ttk_guionly` gives with ..\tcltk\bin on the PATH)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17883>
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