rustix: on Linux, support a build without linux-raw-sys #5313

Job	Run time
Check --no-default-features (nightly)	1m 0s
Test rustix_use_experimental_asm (powerpc-linux)	1m 18s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 58s
Check (stable)	2m 44s
Test rustix_use_experimental_asm (s390x-linux)	2m 39s
Check (1.63)	2m 51s
Check (nightly)	2m 37s
Check selected Tier 3 platforms (nightly)	6m 3s
Test use-libc (powerpc-linux)	41s
Test use-libc (aarch64-linux)	37s
Test use-libc (ubuntu)	28s
Test use-libc (arm-linux)	33s
Test use-libc (s390x-linux)	33s
Test use-libc (riscv64-linux)	33s
Test use-libc (powerpc64le-linux)	44s
Test use-libc (i686-linux)	31s
Test (ubuntu-22.04)	44s
Test (ubuntu)	49s
Test (powerpc-linux)	1m 6s
Test (powerpc64le-linux)	1m 5s
Test (riscv64-linux)	1m 4s
Test (i686-linux)	1m 6s
Test (arm-linux)	1m 17s
Test (s390x-linux)	1m 1s
Test (riscv64-linux-stable)	1m 6s
Test (aarch64-linux-stable)	1m 5s
Test (i686-linux-stable)	1m 6s
Test (s390x-linux-stable)	50s
Test (powerpc-linux-stable)	1m 6s
Test (ubuntu-stable)	49s
Test (powerpc64le-linux-stable)	1m 6s
Test (riscv64-linux-1.63)	1m 5s
Test (s390x-linux-1.63)	1m 6s
Rustfmt	6s
Test (i686-linux-1.63)	1m 6s
Test (powerpc64le-linux)	1m 6s
Test (windows-2019)	55s
Test (macos-13)	49s
Test (arm-linux-1.63)	1m 6s
Test (musl)	39s
Test (aarch64-linux-1.63)	1m 5s
Test (arm-linux-stable)	1m 6s
Test (windows)	55s
Test (ubuntu-1.63)	1m 5s
Test (powerpc-linux-1.63, ubuntu-latest, 1.63, powerpc-unknown-linux-gnu, gcc-powerpc-linux-gnu, ...	1m 6s
Test (powerpc64le-linux-1.63)	1m 7s
Test (aarch64-linux)	52s
Check nightly-only targets (nightly)	25s
Test (macos-latest)	1m 6s
	57m 55s

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