Add `ip(v6)_checksum` socket options #5530

Job	Run time
Check --no-default-features (nightly)	57s
Check (nightly)	2m 52s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 15s
Check (stable)	2m 47s
Check nightly-only targets (nightly)	18s
Test use-libc (riscv64-linux)	1m 18s
Test rustix_use_experimental_asm (powerpc-linux)	1m 18s
Test use-libc (powerpc64le-linux)	1m 13s
Test rustix_use_experimental_asm (s390x-linux)	1m 15s
Test use-libc (powerpc-linux)	1m 13s
Test use-libc (aarch64-linux)	1m 12s
Check selected Tier 3 platforms (nightly)	2m 6s
Test use-libc (i686-linux)	1m 6s
Test use-libc (ubuntu)	38s
Test use-libc (s390x-linux)	1m 18s
Test use-libc (arm-linux)	1m 15s
Check (1.63)	3m 2s
Rustfmt	5s
Test (i686-linux)	39s
Test (ubuntu-22.04)	40s
Test (arm-linux)	37s
Test (riscv64-linux-1.63)	36s
Test (arm-linux-stable)	40s
Test (ubuntu-stable)	40s
Test (aarch64-linux-stable)	30s
Test (s390x-linux)	39s
Test (ubuntu-1.63)	40s
Test (powerpc-linux-stable)	32s
Test (aarch64-linux)	40s
Test (aarch64-linux-1.63)	37s
Test (powerpc-linux)	36s
Test (powerpc64le-linux)	40s
Test (s390x-linux-stable)	28s
Test (powerpc64le-linux-stable)	31s
Test (i686-linux-stable)	28s
Test (macos-15-intel)	27s
Test (powerpc64le-linux)	37s
Test (riscv64-linux)	35s
Test (musl)	41s
Test (riscv64-linux-stable)	35s
Test (arm-linux-1.63)	37s
Test (macos-latest)	24s
Test (powerpc64le-linux-1.63)	38s
Test (s390x-linux-1.63)	39s
Test (ubuntu)	39s
Test (windows)	30s
Test (powerpc-linux-1.63, ubuntu-latest, 1.63, powerpc-unknown-linux-gnu, gcc-powerpc-linux-gnu, ...	38s
Test (i686-linux-1.63)	35s
Test (macos-14)	27s
	43m 23s

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