Remove unused Cleanup() call

It was used to clean up shared memory.  We don't construct that anymore,
so remove the useless call.

Change-Id: I8087cef2afce184f66721a9995a63053fb278ec7
diff --git a/frc971/wpilib/wpilib_robot_base.h b/frc971/wpilib/wpilib_robot_base.h
index ea68306..3404bb8 100644
--- a/frc971/wpilib/wpilib_robot_base.h
+++ b/frc971/wpilib/wpilib_robot_base.h
@@ -29,9 +29,7 @@
       thread.join();
     }
 
-    AOS_LOG(ERROR, "Exiting WPILibRobot\n");
-
-    ::aos::Cleanup();
+    LOG(ERROR) << "Exiting WPILibRobot";
   }
 
  protected: