p256

Revert "p521: fiat-constify update (#1003)" #1978

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	2m 26s
build (1.65.0, wasm32-unknown-unknown)	2m 20s
build (stable, thumbv7em-none-eabi)	45s
cross (armv7-unknown-linux-gnueabihf, 1.65.0)	3m 20s
build (stable, wasm32-unknown-unknown)	42s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 34s
cross (aarch64-unknown-linux-gnu, 1.65.0)	3m 9s
cross (aarch64-unknown-linux-gnu, stable)	1m 27s
cross (powerpc-unknown-linux-gnu, 1.65.0)	3m 4s
cross (powerpc-unknown-linux-gnu, stable)	1m 24s
doc	52s
test (i686-unknown-linux-gnu, 1.65.0, sudo apt update && sudo apt install gcc-multilib)	3m 36s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 49s
test (x86_64-unknown-linux-gnu, 1.65.0)	3m 22s
test (x86_64-unknown-linux-gnu, stable)	1m 26s
	31m 16s

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