Bug#953525: snowball: Please make autopkgtests cross-test-friendly

[stefanor]

Hi Gianfranco (2020.03.10_12:36:14_+0000)
> control: tags -1 patch pending
> 
> this change and the python->python2 move is now in deferred/10

Feel free to reschedule to 0.

Thanks!

SR

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Stefano Rivera
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