Don't rerun if PATH changes #1851

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Job	Run time
Clippy	21s
Test CUDA support	47s
Test wasm (wasm32-unknown-unknown)	18s
Test build-std (aarch64-tvos)	2m 45s
Test build-std (aarch64-tvos-sim)	2m 54s
MSRV (ubuntu-latest)	1m 2s
Rustfmt	10s
MSRV (windows-latest)	1m 30s
Test build-std (x86_64-tvos)	1m 43s
semver-checks	2m 31s
MSRV (macos-latest)	1m 15s
Test (stable)	1m 29s
Test (beta)	1m 22s
Test (nightly)	1m 26s
Test (linux32)	1m 40s
Test (macos)	3m 1s
Test (aarch64-macos)	1m 45s
Test (aarch64-ios)	1m 20s
Test (win32)	3m 25s
Test (win64)	3m 36s
Test (mingw32)	3m 14s
Test (mingw64)	3m 18s
Test (windows-2019)	3m 52s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 44s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	5m 12s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	5m 53s
	59m 33s

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