[issue18441] Idle: Make test.support.requires('gui') skip when it should.

[Ned Deily]

Ned Deily added the comment:

See Issue8716 for the history of check_tk_availability().  At the time, the Tk tests were the only ones trying to create real Tk objects (and thus causing crashes on some buildbot configurations).  With the addition of IDLE tests that call Tk, it probably makes sense to refactor check_tk_availability() into the common test test_support/support helper module so it can be used globally.

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nosy: +ned.deily

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<http://bugs.python.org/issue18441>
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