Fix compilation on non-x86 with linux_latest. #3679

Job	Run time
Check nightly-only targets (nightly)	20s
Check --no-default-features (nightly)	56s
Check selected Tier 3 platforms (nightly)	4m 1s
Check (stable)	5m 59s
Check (nightly)	6m 21s
Rustfmt	8s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 4s
Check (1.63)	10m 23s
Test (ubuntu)	46s
Test (ubuntu-20.04)	42s
Test use-libc (ubuntu)	46s
Test (i686-linux)	56s
Test use-libc (i686-linux)	53s
Test (aarch64-linux)	1m 4s
Test (powerpc64le-linux)	1m 3s
Test use-libc (aarch64-linux)	1m 3s
Test (riscv64-linux)	1m 4s
Test use-libc (powerpc64le-linux)	1m 6s
Test (s390x-linux)	1m 4s
Test use-libc (riscv64-linux)	1m 7s
Test (arm-linux)	1m 3s
Test use-libc (arm-linux)	1m 3s
Test (ubuntu-stable)	36s
Test (i686-linux-stable)	58s
Test (aarch64-linux-stable)	1m 5s
Test (riscv64-linux-stable)	55s
Test (s390x-linux-stable)	1m 6s
Test (powerpc64le-linux-stable)	56s
Test (arm-linux-stable)	1m 23s
Test (ubuntu-1.63)	2m 36s
Test (i686-linux-1.63)	3m 2s
Test (aarch64-linux-1.63)	3m 3s
Test (riscv64-linux-1.63)	3m 9s
Test (s390x-linux-1.63)	2m 52s
Test (powerpc64le-linux-1.63)	2m 49s
Test (arm-linux-1.63)	3m 4s
Test (macos-latest)	1m 40s
Test (macos-11)	1m 10s
Test (windows)	51s
Test (windows-2019)	48s
Test (musl)	42s
	1h 15m 37s

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