Fixes Mantis #3255. Thank you kindly, MCortez, for a patch that:

Changes to IWindModule interface: Change from assuming a single array of 
256 Vector2 values to a lookup function that takes region x, y, z and returns a Vector3
* Changed llWind() to use new lookup method of IWindModule
* Moved logic for determining the wind at a given point in the data array from 
llWind() to the Wind Module itself.

OpenSim/Region/Framework/Interfaces/IWindModule.cs

@@ -31,9 +31,10 @@ namespace OpenSim.Region.Framework.Interfaces
 {
     public interface IWindModule : IRegionModule
     {
-        Vector2[] WindSpeeds
-        {
-            get;
-        }
+        
+        /// <summary>
+        /// Retrieves the current wind speed at the given Region Coordinates
+        /// </summary>
+        Vector3 WindSpeed(int x, int y, int z);
     }
 }