Support finding Windows tools on non-Windows host #966

Job	Run time
Test CUDA support	39s
Test aarch64-apple-tvos	2m 37s
Clippy	6s
MSRV (ubuntu-latest)	30s
Rustfmt	15s
MSRV (windows-latest)	39s
Test (stable)	37s
Test (beta)	26s
Test (nightly)	34s
Test (linux32)	35s
Test (macos)	33s
Test (aarch64-ios)	34s
Test (win32)	24s
Test (win64)	28s
Test (mingw32)	31s
Test (mingw64)	30s
Test (windows-2019)	29s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	29s
	10m 56s

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