Fix gen-windows-sys-binding #1656

Job	Run time
Test CUDA support	23s
Test (stable)	40s
Clippy	26s
Test build-std (aarch64-tvos)	1m 37s
Test (beta)	38s
Test build-std (aarch64-tvos-sim)	1m 37s
Test (nightly)	1m 11s
MSRV (ubuntu-latest)	22s
Test build-std (x86_64-tvos)	1m 33s
Rustfmt	11s
Test (linux32)	1m 28s
MSRV (windows-latest)	45s
Test (macos)	2m 27s
Test (aarch64-macos)	1m 5s
semver-checks	9s
Test (aarch64-ios)	45s
Test (win32)	1m 13s
Test (win64)	2m 51s
Test (mingw32)	1m 35s
Test (mingw64)	1m 57s
Test (windows-2019)	2m 3s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 47s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	2m 40s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	1m 24s
	31m 47s

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