Convert BaseProvider range check to world coords.

OpenRA.Mods.RA/Player/PlaceBuilding.cs

@@ -83,18 +83,11 @@ namespace OpenRA.Mods.RA
 
 					if (buildingInfo.RequiresBaseProvider)
 					{
-						var center = buildingInfo.CenterLocation(order.TargetLocation);
-						foreach (var bp in w.ActorsWithTrait<BaseProvider>())
-						{
-							if (bp.Actor.Owner.Stances[self.Owner] != Stance.Ally || !bp.Trait.Ready())
-								continue;
-
-							if (Combat.IsInRange(center, bp.Trait.Info.Range, bp.Actor.CenterLocation))
-							{
-								bp.Trait.BeginCooldown();
-								break;
-							}
-						}
+						// May be null if the build anywhere cheat is active
+						// BuildingInfo.IsCloseEnoughToBase has already verified that this is a valid build location
+						var producer = buildingInfo.FindBaseProvider(w, self.Owner, order.TargetLocation);
+						if (producer != null)
+							producer.Trait<BaseProvider>().BeginCooldown();
 					}
 
 					if (GetNumBuildables(self.Owner) > prevItems)