mapmap: mark broken

the mapmap binary segfaults at the moment at master and nixos-18.09. I
will speak with upstream for a fix and mark this broken in the meantime.

pkgs/applications/video/mapmap/default.nix

@@ -57,6 +57,8 @@ mkDerivation rec {
     license = licenses.gpl3;
     maintainers = [ maintainers.erictapen ];
     platforms = platforms.linux;
+    # binary segfaults at the moment
+    broken = true;
   };
 
 }