~ruther/avr-device

ref: 91a69cbc82d0cb1c0c76e884232b441431626449 avr-device/patch/common/tiny d---------
9c2e7ecd — Andrew Dona-Couch 5 years ago 
Extract common EXINT patch from tiny84/85
f64c737b — Andrew Dona-Couch 5 years ago 
Extract common USI patch from tiny84/85