Reduce the need for the host target triple #1883

Job	Run time
Test wasm (wasm32-unknown-unknown)	21s
Test CUDA support	43s
Test build-std (aarch64-tvos)	1m 53s
Clippy	11s
Test build-std (aarch64-tvos-sim)	1m 45s
MSRV (ubuntu-latest)	25s
Test build-std (x86_64-tvos)	1m 46s
Rustfmt	11s
semver-checks	21s
MSRV (windows-latest)	51s
MSRV (macos-latest)	26s
Test (stable)	1m 8s
Test (beta)	37s
Test (nightly)	39s
Test (linux32)	1m 39s
Test (macos)	3m 15s
Test (aarch64-macos)	1m 12s
Test (aarch64-ios)	1m 3s
Test (win32)	4m 15s
Test (win64)	3m 29s
Test (mingw32)	3m 10s
Test (mingw64)	3m 25s
Test (windows-2019)	4m 58s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 33s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	4m 48s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	4m 46s
	49m 50s

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