windows: make windows-sys dev-dependency target-specific #235

Job	Run time
bare-cross-build (nightly, x86_64-unknown-haiku)	25s
native-test (nightly, ubuntu-latest)	16s
bare-cross-build (nightly, x86_64-unknown-openbsd)	26s
windows-test (nightly, x86_64-pc-windows-gnu)	1m 19s
native-test (nightly, windows-latest)	41s
cross-ios-build (nightly, aarch64-apple-ios)	18s
bare-cross-build (nightly, x86_64-unknown-redox)	25s
windows-test (nightly, i686-pc-windows-gnu)	1m 12s
native-test (nightly, macOS-latest)	33s
cross-ios-build (nightly, x86_64-apple-ios)	20s
bare-cross-build (nightly, x86_64-fuchsia)	27s
windows-test (stable, x86_64-pc-windows-gnu)	1m 26s
native-test (stable, ubuntu-latest)	11s
cross-ios-build (stable, aarch64-apple-ios)	12s
windows-test (stable, i686-pc-windows-gnu)	1m 25s
native-test (stable, windows-latest)	1m 23s
cross-ios-build (stable, x86_64-apple-ios)	20s
bare-cross-build (nightly, wasm32-unknown-unknown)	22s
native-test (stable, macOS-latest)	26s
native-test (1.56.0, ubuntu-latest)	3m 28s
native-test (1.56.0, windows-latest)	4m 31s
native-test (1.56.0, macOS-latest)	5m 22s
	25m 28s

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