Fix warnings for system

modules/hm/gnome.nix

@@ -13,7 +13,7 @@ in
 
   config = (
     lib.mkIf cfg {
-      programs.gnome-terminal = lib.mkIf (pkgs.system != "x86_64-darwin") {
+      programs.gnome-terminal = lib.mkIf (pkgs.stdenv.hostPlatform.system != "x86_64-darwin") {
         enable = true;
         showMenubar = true;
         themeVariant = "dark";

modules/hm/gui.nix

@@ -8,7 +8,9 @@
 let
   cfg = config.greg.gui;
 
-  excludes = systems: opts: (if (builtins.all (x: pkgs.system != x) systems) then opts else [ ]);
+  excludes =
+    systems: opts:
+    (if (builtins.all (x: pkgs.stdenv.hostPlatform.system != x) systems) then opts else [ ]);
 
   vars = {
     XDG_CURRENT_DESKTOP = "GNOME";