Merge pull request #214418 from k3a/macos-diffuse

diffuse: macos support

pkgs/applications/misc/diffuse/default.nix

···
     pygobject3
   ];
 
+  preConfigure = ''
+    # app bundle for macos
+    substituteInPlace src/diffuse/meson.build data/icons/meson.build --replace "/Applications" "$out/Applications";
+  '';
+
   mesonFlags = [
     "-Db_ndebug=true"
   ];
···
     description = "Graphical tool for merging and comparing text files";
     license = licenses.gpl2;
     maintainers = with maintainers; [ k3a ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }