p192

p521: add `ecdh` feature (#954) #202

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	6m 7s
doc	28s
build (1.65.0, wasm32-unknown-unknown)	4m 57s
build (stable, thumbv7em-none-eabi)	36s
test (i686-unknown-linux-gnu, 1.65.0, sudo apt update && sudo apt install gcc-multilib)	6m 27s
build (stable, wasm32-unknown-unknown)	32s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 17s
test (x86_64-unknown-linux-gnu, 1.65.0)	5m 31s
test (x86_64-unknown-linux-gnu, stable)	44s
	26m 39s

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