Support finding Windows tools on non-Windows host #968

Job	Run time
Test aarch64-apple-tvos	3m 43s
Test CUDA support	49s
Clippy	14s
MSRV (ubuntu-latest)	27s
Rustfmt	4s
MSRV (windows-latest)	42s
Test (stable)	37s
Test (beta)	26s
Test (nightly)	40s
Test (linux32)	53s
Test (macos)	47s
Test (aarch64-ios)	2m 13s
Test (win32)	1m 10s
Test (win64)	2m 12s
Test (mingw32)	1m 28s
Test (mingw64)	1m 39s
Test (windows-2019)	2m 16s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 14s
	22m 34s

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