~ruther/avr-device

ref: 9bda0162343c07f23b589259c8d4be85cdc65c0c 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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