[issue32146] multiprocessing freeze_support needed outside win32

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I'm sorry about not seeing your PR before.  Would you like to update it against current git master?

(note I'm not thrilled by the use of the "ast" module; I hope we can change the command-line args so that this isn't needed)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32146>
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