Remove extern C declaration from local module functions

Author: pennam

src/ArduinoIoTCloudLPWAN.cpp

@@ -37,7 +37,7 @@ static size_t const CBOR_LORA_MSG_MAX_SIZE = 255;
    LOCAL MODULE FUNCTIONS
  ******************************************************************************/
 
-extern "C" unsigned long getTime()
+unsigned long getTime()
 {
   return ArduinoCloud.getInternalTime();
 }

src/ArduinoIoTCloudTCP.cpp

@@ -59,17 +59,17 @@ extern RTC_HandleTypeDef RTCHandle;
    LOCAL MODULE FUNCTIONS
  ******************************************************************************/
 
-extern "C" unsigned long getTime()
+unsigned long getTime()
 {
   return ArduinoCloud.getInternalTime();
 }
 
-extern "C" void updateTimezoneInfo()
+void updateTimezoneInfo()
 {
   ArduinoCloud.updateInternalTimezoneInfo();
 }
 
-extern "C" void setThingIdOutdated()
+void setThingIdOutdated()
 {
   ArduinoCloud.setThingIdOutdatedFlag();
 }