Support finding Windows tools on non-Windows host #969

Job	Run time
Test CUDA support	35s
MSRV (ubuntu-latest)	26s
Test aarch64-apple-tvos	4m 12s
Clippy	9s
MSRV (windows-latest)	45s
Rustfmt	11s
Test (stable)	22s
Test (beta)	47s
Test (nightly)	41s
Test (linux32)	1m 1s
Test (macos)	53s
Test (aarch64-ios)	1m 9s
Test (win32)	1m 26s
Test (win64)	1m 56s
Test (mingw32)	1m 10s
Test (mingw64)	1m 25s
Test (windows-2019)	2m 28s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 3s
	21m 39s

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