~ruther/avr-device

ref: 7082fe78df878b31dae845314448d641282574be avr-device/patch/common/tiny d---------
9c2e7ecd — Andrew Dona-Couch 4 years ago 
Extract common EXINT patch from tiny84/85
f64c737b — Andrew Dona-Couch 4 years ago 
Extract common USI patch from tiny84/85
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