[issue7849] Improve "test_support.check_warnings()"

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

I backported this to 2.6 in r83537 in order to fix #7092. I used a leading underscore on _check_py3k_warnings to make it private because no new features should be added to 2.6.

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