ledger-3.1.1: mark build broken

pkgs/applications/office/ledger/default.nix

···
     '';
 
     platforms = stdenv.lib.platforms.all;
-    maintainers = with stdenv.lib.maintainers; [ peti the-kenny jwiegley ];
+    maintainers = with stdenv.lib.maintainers; [ the-kenny jwiegley ];
+    broken = true;
   };
 }