manual struct target feature #1232

Job	Run time
Smoke-test fuzzing targets (default)	2m 34s
Clippy	19s
Smoke-test fuzzing targets (c-allocator)	2m 31s
Clippy (--no-default-features --features="c-allocator")	19s
Smoke-test fuzzing targets (rust-allocator)	2m 42s
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc)	41s
Clippy (--no-default-features --features="rust-allocator")	20s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	40s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	52s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	59s
cargo-c dynamic library	11s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	58s
vanilla dynamic library	13s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 16s
Smoke-test fuzzing targets (stable, macos-14, aarch64-apple-darwin)	2m 51s
Build and test (stable, macos-14, aarch64-apple-darwin)	55s
Miri	1m 55s
Build and test (stable-x86_64-gnu, windows-2022, x86_64-pc-windows-gnu)	3m 13s
run flate2 test suite	17s
wasm32	47s
	24m 33s

Provide feedback