Matches https://github.com/ilyagr/pijul-clone as of now, might become out of sync

Removing xxHash from the Nix dependencies

Created by  pmeunier  on September 15, 2021
NX6DDK7R772P6ZE6OIX334JL3YEQPOD6G4KNHVKTQITPSTKXWGNQC
Change contents