only include wayland in devshell on macos

linux/nix/devshell.nix

@@ -18,20 +18,22 @@ let
   };
 in
 pkgs.mkShell {
-  packages = with pkgs; [
+  packages =
-    go
+    with pkgs;
-    git
+    [
-    jdk17
+      go
-    libGL
+      git
-    wayland
+      jdk17
-    (flutter.override {
+      libGL
-      extraPkgConfigPackages = [
+      (flutter.override {
-        mpv-unwrapped
+        extraPkgConfigPackages = [
-        libass
+          mpv-unwrapped
-      ];
+          libass
-    })
+        ];
-    android.platform-tools
+      })
-  ];
+      android.platform-tools
+    ]
+    ++ lib.optional pkgs.stdenv.isLinux wayland;
 
   env = rec {
     LIBCLANG_PATH = lib.makeLibraryPath [ pkgs.libclang ];