[issue9115] test_site: support for systems without unsetenv

[Zsolt Cserna]

Zsolt Cserna <zsolt.cserna at morganstanley.com> added the comment:

I confirm that this patch fixes the problem. Thanks.

On my systems I haven't seen other bugs related to unsetenv - however, it might be useful to fix subprocess.Popen and subprocess.call to use the os.environ by default (but this would be another request or discussion).

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<http://bugs.python.org/issue9115>
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