Use raw-dylib for windows-sys #1709

Job	Run time
Test build-std (aarch64-tvos)	1m 40s
Test build-std (aarch64-tvos-sim)	1m 43s
Clippy	29s
Test CUDA support	35s
Test build-std (x86_64-tvos)	1m 57s
MSRV (ubuntu-latest)	1m 59s
Rustfmt	8s
semver-checks	9s
MSRV (windows-latest)	2m 30s
MSRV (macos-latest)	2m 8s
Test (stable)	33s
Test (beta)	37s
Test (nightly)	32s
Test (linux32)	1m 33s
Test (macos)	3m 0s
Test (aarch64-macos)	1m 10s
Test (aarch64-ios)	43s
Test (win32)	1m 45s
Test (win64)	1m 23s
Test (mingw32)	1m 49s
Test (mingw64)	1m 39s
Test (windows-2019)	2m 14s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 36s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	3m 29s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	3m 14s
	40m 35s

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