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ctutils: use `cast_(un)signed`; MSRV 1.87 (#1548) #2398

Job	Run time
test (1.85.0)	19s
build (1.85.0, wasm32-unknown-unknown)	18s
build (stable, thumbv7em-none-eabi)	19s
build (1.85.0, thumbv7em-none-eabi)	14s
build (stable, wasm32-unknown-unknown)	19s
miri (x86_64-unknown-linux-gnu)	36s
test (stable)	18s
miri (s390x-unknown-linux-gnu)	38s
minimal-versions / minimal-versions	26s
	3m 27s