k256

p521: `arithmetic` feature (#953) #1975

Job	Run time
benches (1.65.0)	4m 35s
cross (armv7-unknown-linux-gnueabihf, 1.65.0)	8m 11s
benches (stable)	2m 14s
build (1.65.0, thumbv7em-none-eabi)	6m 33s
cross (armv7-unknown-linux-gnueabihf, stable)	2m 6s
build (1.65.0, wasm32-unknown-unknown)	6m 38s
cross (aarch64-unknown-linux-gnu, 1.65.0)	8m 1s
build (stable, thumbv7em-none-eabi)	40s
doc	40s
cross (aarch64-unknown-linux-gnu, stable)	2m 50s
build (stable, wasm32-unknown-unknown)	1m 2s
cross (powerpc-unknown-linux-gnu, 1.65.0)	4m 32s
cross (powerpc-unknown-linux-gnu, stable)	1m 23s
test (i686-unknown-linux-gnu, 1.65.0, sudo apt update && sudo apt install gcc-multilib)	5m 3s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 50s
test (x86_64-unknown-linux-gnu, 1.65.0)	4m 43s
test (x86_64-unknown-linux-gnu, stable)	2m 34s
	1h 3m 35s

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