[issue17883] Fix buildbot testing of Tkinter

[Roundup Robot]

Roundup Robot added the comment:

New changeset 72c3ca3ed22a by Zachary Ware in branch '2.7':
Issue #17883: Tweak test_tcl testLoadWithUNC to skip the test in the
http://hg.python.org/cpython/rev/72c3ca3ed22a

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<http://bugs.python.org/issue17883>
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