ecdsa

rfc6979: allow the use of non-block_api-backed hashes #2685

Job	Run time
no_std (thumbv7em-none-eabi, 1.85.0)	1m 11s
no_std (wasm32-unknown-unknown, 1.85.0)	1m 11s
test (1.85.0)	35s
no_std (wasm32-unknown-unknown, stable)	53s
no_std (thumbv7em-none-eabi, stable)	1m 6s
test (stable)	27s
	5m 23s

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