Add cygwin support #1251

Job	Run time
Rustfmt	16s
Test (nightly)	20s
Test (stable)	24s
Test (1.63.0)	2m 42s
Test (windows)	1m 7s
Test (beta)	23s
Clippy	15s
Test (macos)	27s
Check (aarch64-unknown-freebsd)	33s
Check (aarch64-apple-ios)	32s
Check (aarch64-apple-watchos)	34s
Check (aarch64-unknown-linux-gnu)	35s
Check (aarch64-unknown-linux-ohos)	35s
Check (aarch64-apple-darwin)	34s
Check (aarch64-unknown-linux-musl)	35s
Check (aarch64-linux-android)	31s
Check (aarch64-unknown-openbsd)	33s
Check (aarch64-apple-tvos)	36s
Check (armv7-sony-vita-newlibeabihf)	34s
Check (aarch64-unknown-redox)	35s
Check (arm-linux-androideabi)	33s
Check (armv7-linux-androideabi)	32s
Check (sparcv9-sun-solaris)	35s
Check (aarch64-unknown-netbsd)	37s
Check (x86_64-apple-darwin)	36s
Check (arm64_32-apple-watchos)	35s
Check (x86_64-unknown-dragonfly)	35s
Check (i686-unknown-linux-gnu)	36s
Check (x86_64-pc-solaris)	35s
Check (x86_64-pc-cygwin)	36s
Check (x86_64-apple-ios)	35s
Check (i686-linux-android)	33s
Check (x86_64-unknown-fuchsia)	37s
Check (x86_64-pc-windows-msvc)	31s
Check (x86_64-unknown-illumos)	35s
Check (x86_64-unknown-linux-gnu)	36s
Check (x86_64-unknown-linux-musl)	33s
Check (x86_64-unknown-linux-ohos)	36s
Check (x86_64-unknown-freebsd)	36s
Check (x86_64-unknown-openbsd)	36s
Check (x86_64-unknown-netbsd)	34s
Check (x86_64-unknown-redox)	36s
Check (armv7-unknown-linux-ohos)	34s
	26m 3s

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