Add cygwin support #1256

Job	Run time
Docker (aarch64-unknown-linux-gnu)	33s
Docker (arm-unknown-linux-gnueabihf)	35s
Miri	2m 36s
Docker (armv7-unknown-linux-gnueabihf)	49s
MSRV (ubuntu-24.04)	15s
Docker (i586-unknown-linux-gnu)	47s
Build Targets (wasm32-unknown-unknown)	18s
Rustfmt	5s
Docker (i686-unknown-linux-gnu)	29s
Build Targets (wasm32-wasip1)	21s
MSRV (windows-latest)	30s
Build Targets (x86_64-unknown-fuchsia)	18s
Docker (powerpc64-unknown-linux-gnu)	36s
Build Targets (x86_64-fortanix-unknown-sgx)	19s
Docker (s390x-unknown-linux-gnu)	40s
Windows AArch64	41s
Build Targets (x86_64-unknown-illumos)	16s
Docker (x86_64-pc-windows-gnu)	40s
Docker (x86_64-unknown-linux-gnu)	37s
iOS (aarch64-apple-ios)	16s
Docker (x86_64-unknown-linux-musl)	49s
Test (ubuntu-24.04, stable)	1m 59s
iOS (x86_64-apple-ios)	15s
Docker (arm-linux-androideabi)	1m 21s
Test (ubuntu-24.04, beta)	2m 15s
Docker (armv7-linux-androideabi)	1m 22s
iOS (aarch64-apple-ios-macabi)	15s
Test (ubuntu-24.04, nightly)	2m 19s
Docker (aarch64-linux-android)	1m 17s
Test (macos-latest, stable)	58s
Docker (i686-linux-android)	1m 24s
Test (macos-latest, nightly)	1m 17s
Docker (x86_64-linux-android)	1m 15s
Test (windows-latest, stable-x86_64-msvc)	3m 4s
Test (windows-latest, stable-i686-msvc)	2m 40s
Test (windows-latest, stable-x86_64-gnu)	2m 33s
Test (windows-latest, nightly-x86_64-msvc)	1m 30s
Test (windows-latest, nightly-i686-msvc)	2m 11s
Test (windows-latest, nightly-x86_64-gnu)	2m 42s
	43m 7s

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