nix-prefetch-git: add git-lfs dependency

Or else using `nix-prefetch-git --fetch-lfs` results in failure, unless
the user manually extends $PATH before calling nix-prefetch-git (which
is bad UX).

pkgs/tools/package-management/nix-prefetch-scripts/default.nix

···
 { lib, stdenv, makeWrapper, buildEnv
-, breezy, coreutils, cvs, findutils, gawk, git, gnused, mercurial, nix, subversion
+, breezy, coreutils, cvs, findutils, gawk, git, git-lfs, gnused, mercurial, nix, subversion
 }:
 
 let mkPrefetchScript = tool: src: deps:
···
 in rec {
   nix-prefetch-bzr = mkPrefetchScript "bzr" ../../../build-support/fetchbzr/nix-prefetch-bzr [ breezy ];
   nix-prefetch-cvs = mkPrefetchScript "cvs" ../../../build-support/fetchcvs/nix-prefetch-cvs [ cvs ];
-  nix-prefetch-git = mkPrefetchScript "git" ../../../build-support/fetchgit/nix-prefetch-git [ coreutils findutils gawk git ];
+  nix-prefetch-git = mkPrefetchScript "git" ../../../build-support/fetchgit/nix-prefetch-git [ coreutils findutils gawk git git-lfs ];
   nix-prefetch-hg  = mkPrefetchScript "hg"  ../../../build-support/fetchhg/nix-prefetch-hg   [ mercurial ];
   nix-prefetch-svn = mkPrefetchScript "svn" ../../../build-support/fetchsvn/nix-prefetch-svn [ subversion ];