[issue12420] distutils tests fail if PATH is not defined

[Henry Precheur]

Henry Precheur <henry at precheur.org> added the comment:

I've fixed the last failing tests, but I'm unsure it's the right way to do it.

Take a look at the part for Lib/distutils/tests/test_build_ext.py. I just check that os.environ['PATH'] is defined. I'm not 100% certain that this will work on every platforms.

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Added file: http://bugs.python.org/file22504/fix_distutils_tests.diff

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