Removed unrequired pristine-tar build dependency

Antoni Villalongarequested to merge
no-pristinetar into master

AFAIK pristine-tar is no longer required.

I've also noticed that issue:

Marked for autoremoval on 28 August due to pristine-tar: #933031 high

Version 1.10.1+dfsg-6 of tigervnc is marked for autoremoval from testing on Fri 28 Aug 2020. It depends (transitively) on pristine-tar, affected by #933031. You should try to prevent the removal by fixing these RC bugs.

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