[issue30057] signal.signal should check tripped signals

[Jeroen Demeyer]

Changes by Jeroen Demeyer <jdemeyer at cage.ugent.be>:


Added file: http://bugs.python.org/file46802/fix30057-py3.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30057>
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