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

flake: use crate2nix from Nixpkgs

crate2nix is now available in Nixpkgs, so we use it from there, allowing us to drop our workaround preventing the dependency upon LLVM, etc.

Created by  cole-h  on November 28, 2020
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