Add GNU/Hurd support #980

Job	Run time
Rustfmt	14s
Check (armv7-sony-vita-newlibeabihf)	47s
Clippy	37s
Check (i686-unknown-hurd-gnu)	41s
Check (aarch64-apple-ios)	23s
Docs (aarch64-apple-ios)	24s
Check (aarch64-linux-android)	23s
Docs (armv7-sony-vita-newlibeabihf)	35s
Docs (aarch64-linux-android)	23s
Docs (i686-unknown-hurd-gnu)	36s
Test (stable)	35s
Docs (x86_64-apple-darwin)	28s
Docs (x86_64-unknown-fuchsia)	16s
Test (1.63.0)	4m 55s
Check (x86_64-apple-darwin)	22s
Test (beta)	36s
Docs (x86_64-pc-windows-msvc)	20s
Test (nightly)	29s
Docs (x86_64-pc-solaris)	26s
Docs (x86_64-unknown-freebsd)	19s
Test (macos)	59s
Check (x86_64-unknown-fuchsia)	23s
Docs (x86_64-unknown-illumos)	17s
Test (windows)	1m 28s
Docs (x86_64-unknown-linux-gnu)	18s
Check (x86_64-pc-windows-msvc)	23s
Docs (x86_64-unknown-linux-musl)	22s
Check (x86_64-pc-solaris)	22s
Docs (x86_64-unknown-netbsd)	19s
Check (x86_64-unknown-freebsd)	37s
Docs (x86_64-unknown-redox)	20s
Check (x86_64-unknown-illumos)	31s
Docs (armv7-linux-androideabi)	25s
Check (x86_64-unknown-linux-gnu)	18s
Docs (i686-linux-android)	21s
Check (x86_64-unknown-linux-musl)	28s
Check (x86_64-unknown-netbsd)	28s
Check (x86_64-unknown-redox)	23s
Check (armv7-linux-androideabi)	24s
Check (i686-linux-android)	25s
	23m 20s

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