Support `no_unroll` for Ascon #104

Job	Run time
build (1.56.0, armv7a-none-eabi)	3m 20s
test (i686-unknown-linux-gnu, 1.56.0, sudo apt update && sudo apt install gcc-multilib)	4m 17s
build (1.56.0, thumbv7em-none-eabi)	3m 23s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	54s
build (1.56.0, wasm32-unknown-unknown)	3m 24s
test (x86_64-unknown-linux-gnu, 1.56.0)	4m 8s
build (stable, armv7a-none-eabi)	17s
test (x86_64-unknown-linux-gnu, stable)	33s
build (stable, thumbv7em-none-eabi)	12s
build (stable, wasm32-unknown-unknown)	14s
	20m 42s

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