bpo-35526: make __future__.barry_as_FLUFL mandatory for Python 4.0

[chris-rands]

https://bugs.python.org/issue35526

[the-knights-who-say-ni]

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[warsaw]

@chris-rands Happy to merge this once you sign the CLA.

[chris-rands]

@warsaw I signed it, thank you!

[warsaw]

Thanks @chris-rands !

[bedevere-bot]

@warsaw: Please replace # with GH- in the commit message next time. Thanks!