Pass correct argument to rustc -Z ls #4069

Job	Run time
build sccache x86_64-unknown-linux-musl	6m 17s
build sccache-dist x86_64-unknown-linux-musl	4m 31s
check_features (azure)	50s
build sccache aarch64-unknown-linux-musl	6m 37s
clippy ubuntu-latest	1m 22s
coverage ubuntu-22.04 rust nightly	7m 22s
build sccache armv7-unknown-linux-musleabi	6m 17s
check_features (gcs)	53s
clippy macOS-latest	1m 37s
coverage macos-13 rust nightly	8m 56s
build sccache i686-unknown-linux-musl	6m 12s
clippy windows-latest	2m 34s
check_features (gha)	40s
build sccache x86_64-apple-darwin	14m 13s
check_features (memcached)	40s
rustfmt ubuntu-latest	12s
build sccache aarch64-apple-darwin	4m 49s
check_features (redis)	1m 3s
test ubuntu-20.04 rust 1.75.0	2m 42s
build sccache x86_64-pc-windows-msvc	16m 21s
check_features (s3)	54s
test ubuntu-22.04 rust 1.75.0 dist-server	3m 21s
build sccache aarch64-pc-windows-msvc	14m 30s
test freebsd-14.1 rust stable (ubuntu-22.04)	7m 39s
check_features (webdav)	41s
test ubuntu-20.04 rust stable	2m 43s
test ubuntu-20.04 rust beta	2m 49s
toml_format	24s
test ubuntu-20.04 rust nightly	2m 32s
test ubuntu-20.04 rust stable no-default-features	2m 14s
test ubuntu-22.04 rust stable cuda11.8	5m 35s
test ubuntu-24.04 rust 1.75.0 cuda12.6	5m 2s
test macos-13 rust stable	4m 28s
test macos-14 rust stable	2m 42s
test windows-2019 rust 1.75.0 cuda11.8	7m 57s
test windows-2019 rust nightly cuda11.8	7m 52s
test windows-2019 rust beta cuda11.8	8m 5s
test windows-2022 rust 1.75.0 cuda12.6	7m 44s
test windows-2022 rust nightly cuda12.6	8m 55s
test windows-2022 rust beta cuda12.6	8m 20s
release	0s
	3h 18m 35s

Provide feedback