Add PRIM_POS_LOCAL as an alias to PRIM_POSITION for setting the position.

For SL compatibility only

OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs

@@ -7591,6 +7591,15 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                             positionChanged = true;
                             currentPosition = GetSetPosTarget(part, v, currentPosition);
 
+                            break;
+                        case (int)ScriptBaseClass.PRIM_POS_LOCAL:
+                            if (remain < 1)
+                                return;
+
+                            v=rules.GetVector3Item(idx++);
+                            positionChanged = true;
+                            currentPosition = GetSetPosTarget(part, v, currentPosition);
+
                             break;
                         case (int)ScriptBaseClass.PRIM_SIZE:
                             if (remain < 1)