~ruther/avr-device

ref: 5387fdd8116d91cf3d097487ce2782ca05c43496 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