Add ksu related prctl #1

Job	Run time
Check selected Tier 3 platforms (nightly)	1m 56s
Check nightly-only targets (nightly)	22s
Check (stable)	1m 50s
Check --no-default-features (nightly)	16s
Check (nightly)	1m 52s
Rustfmt	8s
Check (1.63)	2m 6s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 8s
Test (ubuntu)	41s
Test (ubuntu-20.04)	45s
Test use-libc (ubuntu)	34s
Test (i686-linux)	56s
Test use-libc (i686-linux)	1m 11s
Test (aarch64-linux)	2m 41s
Test use-libc (aarch64-linux)	55s
Test (powerpc64le-linux)	2m 18s
Test use-libc (powerpc64le-linux)	1m 8s
Test (riscv64-linux)	2m 17s
Test use-libc (riscv64-linux)	1m 4s
Test (s390x-linux)	2m 20s
Test use-libc (arm-linux)	2m 13s
Test (arm-linux)	2m 22s
Test (ubuntu-stable)	34s
Test (i686-linux-stable)	55s
Test (aarch64-linux-stable)	2m 34s
Test (riscv64-linux-stable)	2m 7s
Test (s390x-linux-stable)	2m 3s
Test (powerpc64le-linux-stable)	3m 1s
Test (arm-linux-stable)	2m 20s
Test (ubuntu-1.63)	2m 38s
Test (i686-linux-1.63)	2m 53s
Test (aarch64-linux-1.63)	4m 52s
Test (riscv64-linux-1.63)	4m 13s
Test (s390x-linux-1.63)	4m 37s
Test (powerpc64le-linux-1.63)	4m 45s
Test (arm-linux-1.63)	4m 25s
Test (macos-latest)	17m 48s
Test (macos-11)	0s
Test (windows)	45s
Test (windows-2019)	1m 9s
Test (musl)	45s
	1h 33m 27s

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