Add osCheckODE() function so scripts can configure for running with legacy physics engine.

Function returns 'true' of the physics engine is configured to be 'OpenDynamicsEngine'.
  The presumption is that all other physics engines work the same (like SL) or it is a bug.
  Does not require ossl functions to be enabled.

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

@@ -1627,6 +1627,21 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
             }
         }
 
+        public LSL_Integer osCheckODE()
+        {
+            m_host.AddScriptLPS(1);
+            LSL_Integer ret = 0;    // false
+            if (m_ScriptEngine.World.PhysicsScene != null)
+            {
+                string physEngine = m_ScriptEngine.World.PhysicsScene.EngineType;
+                if (physEngine == "OpenDynamicsEngine")
+                {
+                    ret = 1;    // true
+                }
+            }
+            return ret;
+        }
+
         public string osGetPhysicsEngineType()
         {
             // High because it can be used to target attacks to known weaknesses

OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs

@@ -259,6 +259,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api.Interfaces
 
         string osGetScriptEngineName();
         string osGetSimulatorVersion();
+        LSL_Integer osCheckODE();
         string osGetPhysicsEngineType();
         Object osParseJSONNew(string JSON);
         Hashtable osParseJSON(string JSON);

OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs

@@ -420,6 +420,11 @@ namespace OpenSim.Region.ScriptEngine.Shared.ScriptBase
             return m_OSSL_Functions.osGetScriptEngineName();
         }
 
+        public LSL_Integer osCheckODE()
+        {
+            return m_OSSL_Functions.osCheckODE();
+        }
+
         public string osGetPhysicsEngineType()
         {
             return m_OSSL_Functions.osGetPhysicsEngineType();