xxv: use buildFeatures

pkgs/tools/misc/xxv/default.nix

@@ -25,7 +25,8 @@ rustPlatform.buildRustPackage rec {
 
   # I'm picking pancurses for Windows simply because that's the example given in Cursive's
   # documentation for picking an alternative backend. We could just as easily pick crossterm.
-  cargoBuildFlags = lib.optionals (!useNcurses) [ "--no-default-features" "--features pancurses-backend" ];
+  buildNoDefaultFeatures = !useNcurses;
+  buildFeatures = lib.optional (!useNcurses) "pancurses-backend";
 
   meta = with lib; {
     description = "A visual hex viewer for the terminal";