nix: enable systemd in builds for journald support

Signed-off-by: Peter Hunt <[email protected]>

Author: haircommander

Diff for: nix/derivation.nix

@@ -9,6 +9,7 @@ with pkgs; stdenv.mkDerivation rec {
   nativeBuildInputs = with buildPackages; [
     bash
     gitMinimal
+    systemd
     pkg-config
     which
   ];