p384

p384: remove default `ecdh` feature #2052

Job	Run time
doc	58s
build (1.81.0, thumbv7em-none-eabi)	40s
test (i686-unknown-linux-gnu, 1.81.0, sudo apt update && sudo apt install gcc-multilib)	1m 39s
build (1.81.0, wasm32-unknown-unknown)	38s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 41s
build (stable, thumbv7em-none-eabi)	47s
test (x86_64-unknown-linux-gnu, 1.81.0)	1m 20s
build (stable, wasm32-unknown-unknown)	41s
test (x86_64-unknown-linux-gnu, stable)	1m 23s
cross (armv7-unknown-linux-gnueabihf, 1.81.0)	1m 29s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 29s
cross (aarch64-unknown-linux-gnu, 1.81.0)	1m 18s
cross (aarch64-unknown-linux-gnu, stable)	1m 24s
cross (powerpc-unknown-linux-gnu, 1.81.0)	1m 25s
cross (powerpc-unknown-linux-gnu, stable)	1m 28s
	18m 20s

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