[Freeciv-Dev] Minor fix

[rizos@xxxxxxxx]

On some (rare) occasions, players may have noticed
that a city name appears "out of the blue" in non-explored
areas of the map. The problem appears to be that 
send_city_info() in diplomat_sabotage() (server/unitfunc.c)
sends city info to all players and not only to players
that have "discovered" this tile. I cannot see any reason
for this so i suggest that line 651 (copy of version 1.8.0)
in server/unitfunc.c is changed to:

   send_city_info(0, pcity, 0);