[issue10966] eliminate use of ImportError implicitly representing SkipTest

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

One other option is to simply have a whitelist of platforms that test.support knows of so it only considers it a failure when the platform being run on is known (regrtest does this already).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10966>
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