test_check_specifier fails with the latest packaging

[frenzymadness]

This part of the test no longer raises an exception:

setuptools/setuptools/tests/test_dist.py

Lines 148 to 150 in 1f79847

	attrs = {'name': 'foo', 'python_requires': ['>=3.0', '!=3.1']}
	with pytest.raises(DistutilsSetupError):
	dist = Distribution(attrs)

because of this change in packaging: pypa/packaging@2b06f90 SpecifierSet can be created from a list.

[frenzymadness]

Ah, I forgot that packaging is bundled in setuptools and the mentioned issue is going to be fixed in #4740