tmsu: disable for darwin

Disabling until a solution comes about for osxfuse.

pkgs/tools/filesystems/tmsu/default.nix

···
     description = "A tool for tagging your files using a virtual filesystem";
     maintainers = with maintainers; [ pSub ];
     license     = licenses.gpl3;
-    platforms   = platforms.all;
+    platforms   = platforms.linux;
   };
 }