(PR#15261) Observer ghost cities

<URL: 
http://bugs.freeciv.org/Ticket/Display.html?id=15261
>

> [jdorje - Fri Mar 10 06:10:56 2006]:
> 
> > [dmarks - Tue Jan 24 09:05:46 2006]:
> > 
> > Running latest S2_1: Destroyed cities doesn't get
removed from the map
> > for observers. Observed several times.
> 
> This patch should fix it.  Please test.
> 
> -jason
> 

This patch didn't make any difference I'm afraid.

-Daniel