Fixes needed by io_uring. #3416

Job	Run time
Rustfmt	15s
Check (stable)	2m 6s
Check nightly-only targets (nightly)	37s
Check (nightly)	1m 49s
Check (1.63)	2m 7s
Check --no-default-features (nightly)	1m 11s
Check selected Tier 3 platforms (nightly)	4m 42s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 23s
Test (ubuntu)	37s
Test use-libc (ubuntu)	47s
Test (ubuntu-20.04)	38s
Test (i686-linux)	39s
Test use-libc (i686-linux)	1m 3s
Test (aarch64-linux)	54s
Test use-libc (aarch64-linux)	1m 4s
Test use-libc (powerpc64le-linux)	57s
Test (powerpc64le-linux)	53s
Test (riscv64-linux)	53s
Test use-libc (riscv64-linux)	50s
Test (s390x-linux)	52s
Test use-libc (arm-linux)	57s
Test (arm-linux)	55s
Test (ubuntu-stable)	39s
Test (i686-linux-stable)	49s
Test (aarch64-linux-stable)	55s
Test (riscv64-linux-stable)	43s
Test (s390x-linux-stable)	52s
Test (powerpc64le-linux-stable)	54s
Test (arm-linux-stable)	54s
Test (ubuntu-1.63)	52s
Test (i686-linux-1.63)	54s
Test (aarch64-linux-1.63)	55s
Test (riscv64-linux-1.63)	54s
Test (s390x-linux-1.63)	52s
Test (powerpc64le-linux-1.63)	52s
Test (arm-linux-1.63)	54s
Test (macos-latest)	49s
Test (macos-11)	51s
Test (windows)	39s
Test (windows-2019)	39s
	41m 6s

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