Examples: fix build for Arduino NANO ESP32

Author: pennam

examples/ArduinoIoTCloud-Basic/ArduinoIoTCloud-Basic.ino

@@ -17,7 +17,7 @@
 #include "arduino_secrets.h"
 #include "thingProperties.h"
 
-#if !defined(LED_BUILTIN)
+#if !defined(LED_BUILTIN) && !defined(ARDUINO_NANO_ESP32)
 static int const LED_BUILTIN = 2;
 #endif
 

examples/ArduinoIoTCloud-DeferredOTA/ArduinoIoTCloud-DeferredOTA.ino

@@ -19,7 +19,7 @@
 #include "arduino_secrets.h"
 #include "thingProperties.h"
 
-#if defined(ESP32)
+#if !defined(LED_BUILTIN) && !defined(ARDUINO_NANO_ESP32)
 static int const LED_BUILTIN = 2;
 #endif
 

examples/ArduinoIoTCloud-Schedule/ArduinoIoTCloud-Schedule.ino

@@ -9,7 +9,7 @@
 #include "arduino_secrets.h"
 #include "thingProperties.h"
 
-#if defined(ESP32)
+#if !defined(LED_BUILTIN) && !defined(ARDUINO_NANO_ESP32)
 static int const LED_BUILTIN = 2;
 #endif