Fix tests on illumos. #4505

Job	Run time
Check --no-default-features (nightly)	57s
Check nightly-only targets (nightly)	29s
Check selected Tier 3 platforms (nightly)	5m 4s
Check (stable)	3m 13s
Check (nightly)	3m 23s
Rustfmt	23s
Check (1.63)	3m 28s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 16s
Test rustix_use_experimental_asm (s390x-linux)	1m 4s
Test (ubuntu)	43s
Test use-libc (ubuntu)	36s
Test use-libc (i686-linux)	1m 22s
Test (ubuntu-20.04)	44s
Test use-libc (aarch64-linux)	1m 39s
Test (i686-linux)	1m 5s
Test use-libc (powerpc64le-linux)	1m 27s
Test (aarch64-linux)	1m 9s
Test use-libc (riscv64-linux)	56s
Test (powerpc64le-linux)	1m 7s
Test use-libc (s390x-linux)	1m 7s
Test (riscv64-linux)	1m 17s
Test use-libc (arm-linux)	1m 24s
Test (s390x-linux)	1m 6s
Test (arm-linux)	1m 11s
Test (ubuntu-stable)	46s
Test (i686-linux-stable)	56s
Test (aarch64-linux-stable)	1m 4s
Test (riscv64-linux-stable)	1m 21s
Test (s390x-linux-stable)	1m 41s
Test (powerpc64le-linux-stable)	1m 10s
Test (arm-linux-stable)	54s
Test (ubuntu-1.63)	1m 41s
Test (i686-linux-1.63)	2m 35s
Test (aarch64-linux-1.63)	2m 43s
Test (riscv64-linux-1.63)	2m 7s
Test (s390x-linux-1.63)	1m 48s
Test (powerpc64le-linux-1.63)	1m 58s
Test (arm-linux-1.63)	2m 3s
Test (macos-latest)	29s
Test (macos-13)	48s
Test (windows)	54s
Test (windows-2019)	43s
Test (musl)	38s
	1h 2m 29s

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