ArduinoISP example sketch does not work with Mega or Due

[championswimmer]

The ArduinoISP included example works fine with Uno or Leonardo

But it fails to work for Mega (this works good for Mega https://raw.githubusercontent.com/rsbohn/ArduinoISP/master/ArduinoISP/ArduinoISP.ino)

and it cannot compile at all for Due as arm doesn't support spi_* functions like avr gcc (this works good for Due https://raw.githubusercontent.com/PeterVH/ArduinoISP/due/ArduinoISP/ArduinoISP.ino)

[facchinm]

Solved by #3500