Add missing Task Notification IFDEF (#967)

Wrap the task notification check in vTaskGetInfo() in in a  #if ( configUSE_TASK_NOTIFICATIONS == 1 )

tasks.c

@@ -6211,6 +6211,8 @@ static void prvCheckTasksWaitingTermination( void )
                                 pxTaskStatus->eCurrentState = eBlocked;
                             }
                             else
+                            {
+                                #if ( configUSE_TASK_NOTIFICATIONS == 1 )
                                 {
                                     BaseType_t x;
 
@@ -6228,6 +6230,8 @@ static void prvCheckTasksWaitingTermination( void )
                                         }
                                     }
                                 }
+                                #endif /* if ( configUSE_TASK_NOTIFICATIONS == 1 ) */
+                            }
                         }
                         ( void ) xTaskResumeAll();
                     }