[issue9115] test_site: support for systems without unsetenv

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Attached patch uses a copy of os.environ, like other tests already do.  Can you test it?

Also, is the lack of unsetenv a problem only for test_s_option?  If not, we should fix the test infrastructure, not each test.

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nosy: +eric.araujo
stage:  -> patch review
versions: +Python 3.1, Python 3.2
Added file: http://bugs.python.org/file20167/fix-9115.diff

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