block-buffer: add optional Zeroize implementation (#963) #455

Job	Run time
aarch64 (aarch64-unknown-linux-gnu, 1.60.0)	5m 55s
aarch64 (aarch64-unknown-linux-gnu, stable)	50s
cross (powerpc-unknown-linux-gnu, 1.60.0)	4m 35s
build (1.60.0, armv7a-none-eabi)	4m 10s
cross (powerpc-unknown-linux-gnu, stable)	51s
build (1.60.0, thumbv7em-none-eabi)	4m 51s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	5m 26s
build (1.60.0, wasm32-unknown-unknown)	4m 12s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	1m 9s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	4m 38s
build (stable, armv7a-none-eabi)	8s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	18s
build (stable, thumbv7em-none-eabi)	18s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	6m 4s
build (stable, wasm32-unknown-unknown)	15s
test (x86_64-apple-darwin, macos-latest, stable)	1m 8s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	7m 8s
test (x86_64-pc-windows-msvc, windows-latest, stable)	1m 27s
minimal-versions / minimal-versions	1m 22s
	54m 45s

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