Eliminate more linux_raw_sys types in the public API (#1347) #4934

Job	Run time
Check (stable)	6m 14s
Check selected Tier 3 platforms (nightly)	5m 25s
Check --no-default-features (nightly)	54s
Check (nightly)	6m 14s
Check nightly-only targets (nightly)	21s
Check (1.63)	10m 21s
Rustfmt	14s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 13s
Test rustix_use_experimental_asm (s390x-linux)	1m 7s
Test (ubuntu)	42s
Test use-libc (ubuntu)	45s
Test (ubuntu-20.04)	42s
Test use-libc (i686-linux)	2m 5s
Test (i686-linux)	1m 55s
Test use-libc (aarch64-linux)	1m 14s
Test (aarch64-linux)	1m 3s
Test use-libc (powerpc64le-linux)	1m 14s
Test (powerpc64le-linux)	1m 16s
Test use-libc (riscv64-linux)	1m 21s
Test (riscv64-linux)	1m 11s
Test use-libc (s390x-linux)	1m 16s
Test (s390x-linux)	1m 14s
Test use-libc (arm-linux)	1m 10s
Test (arm-linux)	1m 13s
Test (ubuntu-stable)	44s
Test (i686-linux-stable)	1m 52s
Test (aarch64-linux-stable)	1m 6s
Test (riscv64-linux-stable)	1m 17s
Test (s390x-linux-stable)	1m 11s
Test (powerpc64le-linux-stable)	1m 12s
Test (arm-linux-stable)	1m 5s
Test (ubuntu-1.63)	3m 13s
Test (i686-linux-1.63)	3m 40s
Test (aarch64-linux-1.63)	3m 37s
Test (riscv64-linux-1.63)	4m 28s
Test (s390x-linux-1.63)	4m 27s
Test (powerpc64le-linux-1.63)	3m 43s
Test (arm-linux-1.63)	3m 45s
Test (macos-latest)	41s
Test (macos-13)	51s
Test (windows)	47s
Test (windows-2019)	49s
Test (musl)	46s
	1h 29m 38s

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