fix: serial debug fix for RP2040

Author: gbr1

Diff for: examples/SerialDebug/SerialDebug.ino

@@ -1,9 +1,26 @@
+/*
+  This file is part of the Arduino_ScienceKitCarrier library.
+  Copyright (c) 2023 Arduino SA. All rights reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
 #include "Arduino_ScienceKitCarrier.h"
 
 ScienceKitCarrier science_kit;
 
-TaskHandle_t update_task;
-
 
 void setup() {
   Serial.begin(115200);

Diff for: src/Arduino_ScienceKitCarrier.cpp

@@ -821,9 +821,11 @@ void ScienceKitCarrier::threadExternalTemperature(){
   }
 }
 
+#ifdef ESP32
 void ScienceKitCarrier::freeRTOSExternalTemperature(void * pvParameters){
   ((ScienceKitCarrier*) pvParameters)->threadExternalTemperature();
 }
+#endif
 
 
 /********************************************************************/