smartthreadpool: remove workitems priority. Its lack of fairness could cause issues hard to debug if we tried to use it (we don't) (runprebuild)

ThirdParty/SmartThreadPool/InternalInterfaces.cs

@@ -19,9 +19,4 @@ namespace Amib.Threading.Internal
         /// </summary>   
         IWorkItemResult GetWorkItemResult();
     }
-
-    public interface IHasWorkItemPriority
-    {
-        WorkItemPriority WorkItemPriority { get; }
-    }
 }