[issue11420] Make testsuite pass with -B/DONTWRITEBYTECODE set.

[Ezio Melotti]

Ezio Melotti added the comment:

There are a couple more tests elsewhere that use @skipIf(sys.dont_write_bytecode, ...) directly, but I don't think it's generic enough to be moved to test.support.

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<http://bugs.python.org/issue11420>
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