platform-atmelavr
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fix avrdude WARNING for deprecated setting of lock/unlock fuse.
issue #237. Method: following chip datasheets, set unused 2 most significant bits to 1. Tested OK with PIO core 5.1.0, home 3.3.3, framework-arduino-avr 5.0.0, tool-avrdude 6.3.0, toolchain-atmelavr 5.4.0