FIXME: provide stubs for old macros

This allows at least to bypass the compilation errors on some "catchall" libraries like Adafruit's BusIO.
Code using that macros won't work but we are mostly interested in Wire and SPI

Author: facchinm

cores/arduino/Arduino.h

@@ -57,6 +57,11 @@ void noInterrupts(void);
 
 int digitalPinToInterrupt(pin_size_t pin);
 
+#define digitalPinToPort(x) (x)
+#define digitalPinToBitMask(x) (x)
+#define portOutputRegister(x) (x)
+#define portInputRegister(x) (x)
+
 #include <variant.h>
 #ifdef __cplusplus
 #include <SerialUSB.h>