bzflag: enable on darwin (#52707)

pkgs/games/bzflag/default.nix

@@ -1,5 +1,6 @@
 { stdenv, lib, fetchurl, pkgconfig
-, curl, SDL2, libGLU_combined, glew, ncurses, c-ares }:
+, curl, SDL2, libGLU_combined, glew, ncurses, c-ares
+, Carbon, CoreServices }:
 
 stdenv.mkDerivation rec {
   name = "${pname}-${version}";
@@ -12,13 +13,14 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ curl SDL2 libGLU_combined glew ncurses c-ares ];
+  buildInputs = [ curl SDL2 libGLU_combined glew ncurses c-ares ]
+    ++ lib.optionals stdenv.isDarwin [ Carbon CoreServices ];
 
   meta = with lib; {
     description = "Multiplayer 3D Tank game";
     homepage = https://bzflag.org/;
     license = licenses.lgpl21Plus;
-    platforms = platforms.linux;
+    platforms = platforms.unix;
     maintainers = with maintainers; [ fpletz ];
   };
 }