cmov: fix `size_of` warning on Rust 1.80 #516

Job	Run time
build (1.60.0, thumbv7em-none-eabi)	2m 0s
build (1.60.0, wasm32-unknown-unknown)	1m 59s
build (stable, thumbv7em-none-eabi)	17s
cross (aarch64-unknown-linux-gnu, 1.60.0)	2m 22s
build (stable, wasm32-unknown-unknown)	18s
cross (aarch64-unknown-linux-gnu, stable)	33s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	2m 17s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 16s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	1m 59s
cross (powerpc-unknown-linux-gnu, stable)	33s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	2m 37s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	2m 0s
minimal-versions / minimal-versions	21s
	19m 32s

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