ecdsa

ed25519,ed448: remove std features (#985) #2011

Job	Run time
test (stable)	51s
no_std (thumbv7em-none-eabi, 1.85.0)	2m 42s
test (1.85.0)	50s
no_std (thumbv7em-none-eabi, stable)	2m 47s
no_std (wasm32-unknown-unknown, 1.85.0)	2m 33s
no_std (wasm32-unknown-unknown, stable)	2m 35s
	12m 18s

Provide feedback