[issue19424] _warnings: patch to avoid conversions from/to UTF-8

[Roundup Robot]

Roundup Robot added the comment:

New changeset 494f736f5945 by Victor Stinner in branch 'default':
Issue #19424: PyUnicode_CompareWithASCIIString() normalizes memcmp() result
http://hg.python.org/cpython/rev/494f736f5945

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<http://bugs.python.org/issue19424>
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