ctutils: `Choice::from_u128*` constructors (#1285) #2003

Job	Run time
minimal-versions / minimal-versions	29s
build (stable, thumbv7em-none-eabi)	19s
test (stable)	17s
test (1.85.0)	16s
build (1.85.0, wasm32-unknown-unknown)	15s
build (1.85.0, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	18s
	2m 9s

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