Add GNU/Hurd support #8

Job	Run time
Rustfmt	19s
Test (stable)	29s
Test (1.63.0)	4m 13s
Clippy	20s
Test (beta)	30s
Check (armv7-sony-vita-newlibeabihf)	50s
Docs (aarch64-apple-ios)	17s
Test (nightly)	33s
Check (i686-unknown-hurd-gnu)	41s
Docs (aarch64-linux-android)	23s
Test (macos)	46s
Docs (x86_64-apple-darwin)	20s
Test (windows)	1m 31s
Docs (x86_64-unknown-fuchsia)	20s
Docs (x86_64-pc-windows-msvc)	17s
Check (aarch64-apple-ios)	31s
Docs (x86_64-pc-solaris)	25s
Check (aarch64-linux-android)	30s
Docs (armv7-sony-vita-newlibeabihf)	39s
Docs (x86_64-unknown-freebsd)	21s
Check (x86_64-apple-darwin)	28s
Docs (i686-unknown-hurd-gnu)	51s
Docs (x86_64-unknown-illumos)	22s
Check (x86_64-unknown-fuchsia)	26s
Docs (x86_64-unknown-linux-gnu)	18s
Check (x86_64-pc-windows-msvc)	21s
Docs (x86_64-unknown-linux-musl)	22s
Check (x86_64-pc-solaris)	30s
Docs (x86_64-unknown-netbsd)	19s
Check (x86_64-unknown-freebsd)	27s
Docs (x86_64-unknown-redox)	18s
Check (x86_64-unknown-illumos)	25s
Docs (armv7-linux-androideabi)	24s
Check (x86_64-unknown-linux-gnu)	24s
Check (x86_64-unknown-linux-musl)	29s
Docs (i686-linux-android)	21s
Check (x86_64-unknown-netbsd)	29s
Check (x86_64-unknown-redox)	28s
Check (armv7-linux-androideabi)	28s
Check (i686-linux-android)	23s
	22m 48s

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