Always hash the file prefix #19

Job	Run time
Test aarch64-apple-tvos	1m 8s
Clippy	7s
MSRV (ubuntu-latest)	2m 31s
Test CUDA support	22s
MSRV (windows-latest)	3m 29s
Rustfmt	9s
Test (stable)	19s
Test (beta)	27s
Test (nightly)	15s
Test (linux32)	17s
Test (macos)	27s
Test (aarch64-ios)	25s
Test (win32)	21s
Test (win64)	25s
Test (mingw32)	27s
Test (mingw64)	24s
Test (windows-2019)	23s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	25s
	12m 21s

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