[issue9723] Add shlex.quote

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Someone on Stack Overflow suggested subprocess.list2cmdline.  It’s one of those functions undocumented and absent from __all__ that somehow get found and used by some people.  So when we make the patch, let’s include links to the new function doc from subprocess and pipes, and reply to the Stack Overflow thread.

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