cmpv2

pkcs12: make `zeroize` dependency optional (#1564) #1500

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	27s
build (1.81.0, wasm32-unknown-unknown)	27s
minimal-versions	0s
build (stable, thumbv7em-none-eabi)	22s
test (1.81.0)	3m 28s
build (stable, wasm32-unknown-unknown)	39s
test (stable)	3m 24s
	8m 47s

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