[issue18604] Consolidate gui available checks in test.support

[Zachary Ware]

Zachary Ware added the comment:

Here's a patch for 3.4, and some sample verbose output[1] from the AMD64 Win7 buildbot (which runs buildbot as a service, and thus has no gui available).

[1] http://buildbot.python.org/all/builders/AMD64%20Windows7%20SP1%20custom/builds/40/steps/test/logs/stdio

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keywords: +patch
nosy: +zach.ware
Added file: http://bugs.python.org/file33290/issue18604.diff

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