support csky target in ioctl/linux.rs #3463

Job	Run time
Check (stable)	1m 37s
Check (nightly)	1m 46s
Check nightly-only targets (nightly)	29s
Check selected Tier 3 platforms (nightly)	1m 10s
Check (1.63)	1m 55s
Check --no-default-features (nightly)	14s
Rustfmt	7s
Test rustix_use_experimental_asm (powerpc64le-linux)	50s
Test use-libc (ubuntu)	34s
Test use-libc (i686-linux)	49s
Test (ubuntu)	31s
Test use-libc (aarch64-linux)	52s
Test (ubuntu-20.04)	38s
Test use-libc (powerpc64le-linux)	44s
Test (i686-linux)	48s
Test use-libc (riscv64-linux)	38s
Test (aarch64-linux)	41s
Test use-libc (arm-linux)	46s
Test (powerpc64le-linux)	49s
Test (riscv64-linux)	51s
Test (s390x-linux)	49s
Test (arm-linux)	50s
Test (ubuntu-stable)	30s
Test (i686-linux-stable)	44s
Test (aarch64-linux-stable)	51s
Test (riscv64-linux-stable)	37s
Test (s390x-linux-stable)	49s
Test (powerpc64le-linux-stable)	50s
Test (arm-linux-stable)	51s
Test (ubuntu-1.63)	49s
Test (i686-linux-1.63)	38s
Test (aarch64-linux-1.63)	40s
Test (riscv64-linux-1.63)	37s
Test (s390x-linux-1.63)	48s
Test (powerpc64le-linux-1.63)	49s
Test (arm-linux-1.63)	48s
Test (macos-latest)	5m 34s
Test (macos-11)	46s
Test (windows)	38s
Test (windows-2019)	36s
	36m 23s

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