~ruther/avr-device

ref: b50f869a004631ca673c12f23282bd1a51e24d73 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