Added check for A4 & A5 in analogWrite because it works as a digitalWrite for non-PWM capable pins

Author: Roy, Elizabeth

cores/arduino/wiring_analog.c

@@ -125,6 +125,11 @@ void analogWrite(uint8_t pin, int val)
 	/* Special check for SPI_SS double bonded pin -- no action if SPI is active 
 		(Using Slave Select Disable as indicator of SPI activity) */
 	if((pin == 10) && (SPI0.CTRLB & SPI_SSD_bm)) return;
+	
+	/* Check if TWI is operating on double bonded pin (Master Enable is high 
+	in both Master and Slave mode for bus error detection, so this can 
+	indicate an active state for Wire) */
+	if(((pin == PIN_A4) || (pin == PIN_A5)) && (TWI0.MCTRLA & TWI_ENABLE_bm)) return;
 
 	// We need to make sure the PWM output is enabled for those pins
 	// that support it, as we turn it off when digitally reading or