Add ioctl_getflags and ioctl_setflags #3717

Job	Run time
Check nightly-only targets (nightly)	18s
Check (stable)	1m 6s
Check (nightly)	1m 18s
Check --no-default-features (nightly)	11s
Check selected Tier 3 platforms (nightly)	33s
Check (1.63)	1m 23s
Test rustix_use_experimental_asm (powerpc64le-linux)	35s
Test (ubuntu)	1m 0s
Test use-libc (ubuntu)	30s
Test (ubuntu-20.04)	42s
Rustfmt	8s
Test (i686-linux)	59s
Test (aarch64-linux)	57s
Test use-libc (i686-linux)	40s
Test (powerpc64le-linux)	59s
Test use-libc (aarch64-linux)	48s
Test (riscv64-linux)	57s
Test (s390x-linux)	56s
Test (arm-linux)	58s
Test use-libc (powerpc64le-linux)	48s
Test (ubuntu-stable)	39s
Test use-libc (riscv64-linux)	32s
Test (i686-linux-stable)	56s
Test use-libc (arm-linux)	37s
Test (aarch64-linux-stable)	58s
Test (riscv64-linux-stable)	57s
Test (s390x-linux-stable)	58s
Test (powerpc64le-linux-stable)	57s
Test (arm-linux-stable)	57s
Test (ubuntu-1.63)	57s
Test (i686-linux-1.63)	56s
Test (aarch64-linux-1.63)	58s
Test (riscv64-linux-1.63)	57s
Test (s390x-linux-1.63)	59s
Test (powerpc64le-linux-1.63)	57s
Test (arm-linux-1.63)	59s
Test (macos-latest)	39s
Test (macos-11)	36s
Test (windows)	43s
Test (windows-2019)	44s
Test (musl)	48s
	33m 30s

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