Support finding Windows tools on non-Windows host #967

Job	Run time
MSRV (ubuntu-latest)	20s
Test (stable)	35s
MSRV (windows-latest)	45s
Test aarch64-apple-tvos	4m 3s
Test (beta)	26s
Clippy	39s
Test (nightly)	26s
Test (linux32)	1m 5s
Rustfmt	9s
Test CUDA support	34s
Test (macos)	1m 8s
Test (aarch64-ios)	37s
Test (win32)	1m 34s
Test (win64)	1m 56s
Test (mingw32)	1m 24s
Test (mingw64)	1m 27s
Test (windows-2019)	1m 33s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 18s
	20m 59s

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