fix longest_match for `i686` and `s390x` #1177

Job	Run time
cargo-c dynamic library	11s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	52s
Clippy	16s
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 5s
Clippy (--no-default-features --features="c-allocator")	2m 28s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	35s
Clippy (--no-default-features --features="rust-allocator")	19s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	58s
Smoke-test fuzzing targets (default)	2m 36s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 2s
Smoke-test fuzzing targets (c-allocator)	2m 31s
Build and test (stable, macos-14, aarch64-apple-darwin)	1m 3s
Smoke-test fuzzing targets (stable, macos-14, aarch64-apple-darwin)	2m 52s
Smoke-test fuzzing targets (rust-allocator)	2m 37s
vanilla dynamic library	14s
Build and test (stable-x86_64-gnu, windows-2022, x86_64-pc-windows-gnu)	1m 34s
Miri	2m 2s
run flate2 test suite	19s
wasm32	45s
	25m 0s

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