~ruther/avr-device

ref: fc98f48ac405d2535662808a58bf18a59d513a37 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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