Use Cargo's target information when possible #1925

Job	Run time
Clippy	9s
Test CUDA support	38s
Test wasm (wasm32-unknown-unknown)	8s
Test build-std (aarch64-tvos)	22s
Test build-std (aarch64-tvos-sim)	23s
Rustfmt	14s
MSRV (ubuntu-latest)	18s
Test build-std (x86_64-tvos)	24s
semver-checks	2m 31s
MSRV (windows-latest)	38s
MSRV (macos-latest)	30s
Test wasm32-wasip1-thread	29s
Test (stable)	9s
Test (beta)	12s
Test (nightly)	14s
Test (linux32)	22s
Test (macos)	13s
Test (aarch64-macos)	14s
Test (aarch64-ios)	13s
Test (win32)	18s
Test (win64)	11s
Test (mingw32)	19s
Test (mingw64)	19s
Test (windows-2019)	9s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	11s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	23s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	24s
	10m 35s

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