`future_builtins` shouldn't be blacklisted

[oprypin]

So I started my Kivy application on Android, only to have it crash right after the loading screen.
To my great surprise, the cause of the problem was:

from future_builtins import *

As I later found out, this is because the module is blacklisted.

This module is very useful for making Python 2 bearable behave more like Python 3 and it makes single-codebase 2.x+3.x compatibility easy. It is also very small (future_builtins.c is 3.0 KiB and future_builtins.so is 7.5 KiB).
I think it should not be blacklisted.

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[FeralBytes]

Although I agree. This issue has details to help you use Python 3 syntax.

[inclement]

This was never blacklisted under SDL2, and I've removed it from the old pygame backend too.