Extra socket options: SO_ACCEPTCONN, TCP_KEEPCNT, TCP_KEEPIDLE, TCP_KEEPINTVL #3224

Job	Run time
Check --no-default-features (nightly)	1m 12s
Check selected Tier 3 platforms (nightly)	45s
Check nightly-only targets (nightly)	33s
Check (stable)	8m 49s
Rustfmt	12s
Check (nightly)	8m 23s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 42s
Check (1.63)	19m 34s
Test (ubuntu)	1m 0s
Test use-libc (ubuntu)	1m 28s
Test (ubuntu-20.04)	1m 7s
Test use-libc (i686-linux)	1m 18s
Test (i686-linux)	1m 15s
Test use-libc (aarch64-linux)	1m 47s
Test (aarch64-linux)	1m 7s
Test use-libc (powerpc64le-linux)	1m 43s
Test (powerpc64le-linux)	1m 14s
Test use-libc (riscv64-linux)	1m 22s
Test (riscv64-linux)	1m 15s
Test use-libc (arm-linux)	1m 30s
Test (s390x-linux)	1m 14s
Test (arm-linux)	1m 16s
Test (ubuntu-stable)	1m 16s
Test (ubuntu-1.63)	1m 15s
Test (i686-linux-stable)	1m 14s
Test (aarch64-linux-stable)	1m 15s
Test (riscv64-linux-stable)	1m 16s
Test (s390x-linux-stable)	1m 15s
Test (powerpc64le-linux-stable)	1m 13s
Test (arm-linux-stable)	1m 14s
Test (ubuntu-1.63)	1m 14s
Test (i686-linux-1.63)	1m 15s
Test (aarch64-linux-1.63)	1m 14s
Test (riscv64-linux-1.63)	1m 16s
Test (s390x-linux-1.63)	1m 13s
Test (powerpc64le-linux-1.63)	1m 17s
Test (arm-linux-1.63)	1m 15s
Test (macos-latest)	1m 3s
Test (macos-11)	54s
Test (windows)	1m 0s
Test (windows-2019)	1m 1s
	1h 22m 26s

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