Add GNU/Hurd support #976

Job	Run time
Check (aarch64-apple-ios)	26s
Check (aarch64-linux-android)	30s
Check (x86_64-apple-darwin)	22s
Check (x86_64-unknown-fuchsia)	26s
Check (x86_64-pc-windows-msvc)	26s
Check (x86_64-pc-solaris)	24s
Check (armv7-sony-vita-newlibeabihf)	47s
Check (x86_64-unknown-freebsd)	25s
Check (i686-unknown-hurd-gnu)	47s
Clippy	15s
Check (x86_64-unknown-illumos)	25s
Check (x86_64-unknown-linux-gnu)	20s
Docs (aarch64-apple-ios)	19s
Rustfmt	15s
Docs (aarch64-linux-android)	20s
Docs (armv7-sony-vita-newlibeabihf)	34s
Check (x86_64-unknown-linux-musl)	29s
Check (x86_64-unknown-netbsd)	23s
Docs (x86_64-apple-darwin)	17s
Docs (i686-unknown-hurd-gnu)	35s
Check (x86_64-unknown-redox)	31s
Docs (x86_64-unknown-fuchsia)	22s
Test (stable)	36s
Test (1.63.0)	5m 2s
Check (armv7-linux-androideabi)	23s
Docs (x86_64-pc-windows-msvc)	20s
Docs (x86_64-pc-solaris)	24s
Check (i686-linux-android)	27s
Test (beta)	38s
Docs (x86_64-unknown-freebsd)	22s
Test (nightly)	35s
Docs (x86_64-unknown-illumos)	17s
Test (macos)	37s
Docs (x86_64-unknown-linux-gnu)	18s
Test (windows)	1m 19s
Docs (x86_64-unknown-linux-musl)	25s
Docs (x86_64-unknown-netbsd)	23s
Docs (x86_64-unknown-redox)	17s
Docs (armv7-linux-androideabi)	21s
Docs (i686-linux-android)	17s
	22m 39s

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