oneko: unbreak on aarch64-darwin

pkgs/applications/misc/oneko/default.nix

···
     license = with licenses; [ publicDomain ];
     maintainers = with maintainers; [ xaverdh irenes ];
     platforms = platforms.unix;
-    # never built on aarch64-darwin since first introduction in nixpkgs
-    broken = stdenv.isDarwin && stdenv.isAarch64;
   };
 }