Add GNU/Hurd support #3334

Job	Run time
Check (stable)	4m 48s
Check (nightly)	3m 58s
Check nightly-only targets (nightly)	26s
Check selected Tier 3 platforms (nightly)	3m 34s
Check (1.48)	8m 52s
Check --no-default-features (nightly)	59s
Rustfmt	8s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 1s
Test (ubuntu)	4m 1s
Test (ubuntu-20.04)	56s
Test use-libc (ubuntu)	45s
Test (i686-linux)	1m 26s
Test (aarch64-linux)	3m 33s
Test (powerpc64le-linux)	1m 22s
Test use-libc (i686-linux)	1m 29s
Test (riscv64-linux)	2m 57s
Test use-libc (aarch64-linux)	3m 41s
Test use-libc (powerpc64le-linux)	1m 8s
Test (s390x-linux)	3m 16s
Test use-libc (riscv64-linux)	2m 35s
Test (arm-linux)	3m 8s
Test use-libc (arm-linux)	3m 3s
Test (ubuntu-stable)	39s
Test (ubuntu-1.48)	4m 10s
Test (i686-linux-stable)	1m 8s
Test (aarch64-linux-stable)	3m 24s
Test (riscv64-linux-stable)	3m 18s
Test (s390x-linux-stable)	2m 52s
Test (powerpc64le-linux-stable)	1m 31s
Test (arm-linux-stable)	3m 42s
Test (ubuntu-1.48)	5m 49s
Test (i686-linux-1.48)	5m 25s
Test (aarch64-linux-1.48)	8m 25s
Test (riscv64-linux-1.48)	7m 35s
Test (s390x-linux-1.48)	7m 39s
Test (powerpc64le-linux-1.48)	4m 49s
Test (arm-linux-1.48)	7m 8s
Test (macos-latest)	52s
Test (macos-11)	52s
Test (windows)	55s
Test (windows-2019)	1m 26s
	2h 8m 45s

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