[issue16353] add function to os module for getting path to default shell

[Akira Li]

Changes by Akira Li <4kir4.1i at gmail.com>:


Added file: http://bugs.python.org/file37140/os.get_shell_executable-3.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16353>
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