remove adler32 COPY variant (memcpy is faster) #807

Job	Run time
Clippy	15s
Smoke-test fuzzing targets	1m 56s
Clippy (--no-default-features --features="c-allocator")	18s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 11s
Smoke-test fuzzing targets (--no-default-features --features="c-allocator")	54s
Clippy (--no-default-features --features="rust-allocator")	14s
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc)	41s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 11s
Smoke-test fuzzing targets (--no-default-features --features="rust-allocator")	56s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	1m 0s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	58s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 7s
Smoke-test fuzzing targets (stable, macos-14, aarch64-apple-darwin)	1m 55s
dynamic library	15s
Build and test (stable, macos-14, aarch64-apple-darwin)	1m 9s
Miri	2m 29s
Build and test (stable-x86_64-gnu, windows-2022, x86_64-pc-windows-gnu)	2m 13s
wasm32	23s
	19m 5s

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