aead

elliptic-curve: leverage `CtOption::into_option` (#1595) #2385

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	2m 40s
test (1.65.0)	1m 34s
build (1.65.0, wasm32-unknown-unknown)	1m 42s
test (stable)	17s
build (stable, thumbv7em-none-eabi)	19s
build (stable, wasm32-unknown-unknown)	18s
	6m 50s

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