Support finding Windows tools on non-Windows host #913

Job	Run time
Test CUDA support	26s
MSRV (ubuntu-latest)	24s
Test aarch64-apple-tvos	2m 7s
MSRV (windows-latest)	48s
Rustfmt	10s
Test (stable)	25s
Test (beta)	26s
Test (nightly)	35s
Test (linux32)	1m 2s
Test (macos)	1m 26s
Test (aarch64-ios)	1m 5s
Test (win32)	1m 34s
Test (win64)	1m 18s
Test (mingw32)	1m 32s
Test (mingw64)	1m 3s
Test (windows-2019)	1m 11s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	1m 37s
	17m 9s

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