move cc-test & gen-windows-sys-binding into workspace #993

Job	Run time
Test CUDA support	22s
Test aarch64-apple-tvos	2m 23s
MSRV (ubuntu-latest)	24s
Clippy	8s
MSRV (windows-latest)	49s
Rustfmt	10s
Test (stable)	30s
Test (beta)	37s
Test (nightly)	36s
Test (linux32)	51s
Test (macos)	1m 55s
Test (aarch64-ios)	1m 21s
Test (win32)	1m 28s
Test (win64)	1m 52s
Test (mingw32)	1m 40s
Test (mingw64)	2m 6s
Test (windows-2019)	2m 17s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 0s
	21m 29s

Provide feedback