build: the libavr pin advances over the inlined vector
The vector that inlines its handler is the one advance that could reach a driver on the two-wire bus, and it does not reach this one: `clock` drives the bus from the foreground, so it is byte-identical across the advance in all four modes - 1238 B on the attiny85, 1480 B on the atmega328p. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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