Revert the XEngine memleak patch, it causes premature GC.

This matches behavior seen with an earlier attempt to do this, apparently
the sponsor mechanism does't work in Mono

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

@@ -35,7 +35,7 @@ using log4net;
 
 namespace OpenSim.Region.ScriptEngine.Shared.ScriptBase
 {
-    public class Executor
+    public class Executor : MarshalByRefObject
     {
         // private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
@@ -89,6 +89,26 @@ namespace OpenSim.Region.ScriptEngine.Shared.ScriptBase
             initEventFlags();
         }
 
+        /// <summary>
+        /// Make sure our object does not timeout when in AppDomain. (Called by ILease base class)
+        /// </summary>
+        /// <returns></returns>
+        public override Object InitializeLifetimeService()
+        {
+            //m_log.Debug("Executor: InitializeLifetimeService()");
+            //            return null;
+            ILease lease = (ILease)base.InitializeLifetimeService();
+
+            if (lease.CurrentState == LeaseState.Initial)
+            {
+                lease.InitialLeaseTime = TimeSpan.Zero; // TimeSpan.FromMinutes(1);
+                //                lease.SponsorshipTimeout = TimeSpan.FromMinutes(2);
+                //                lease.RenewOnCallTime = TimeSpan.FromSeconds(2);
+            }
+            return lease;
+        }
+
+
         public scriptEvents GetStateEventFlags(string state)
         {
             //m_log.Debug("Get event flags for " + state);