USB CDC two argument begin()

Add two argument form of Serial_::begin

Signed-off-by: Paul Brook <paul@nowt.org>

hardware/arduino/cores/arduino/CDC.cpp

@@ -134,6 +134,10 @@ void Serial_::begin(unsigned long baud_count)
 {
 }
 
+void Serial_::begin(unsigned long baud_count, byte config)
+{
+}
+
 void Serial_::end(void)
 {
 }

hardware/arduino/cores/arduino/USBAPI.h

@@ -31,6 +31,7 @@ private:
 	ring_buffer *_cdc_rx_buffer;
 public:
 	void begin(unsigned long);
+	void begin(unsigned long, uint8_t);
 	void end(void);
 
 	virtual int available(void);