windows_registry: Allow only specifying the architecture #2016

Job	Run time
Test CUDA support	44s
Test wasm (wasm32-unknown-unknown)	22s
Test build-std (aarch64-tvos)	2m 16s
Test (stable)	1m 32s
Test wasm32-wasip1-thread	36s
Test build-std (aarch64-tvos-sim)	1m 59s
Clippy	19s
Test (beta)	1m 53s
MSRV (ubuntu-latest)	19s
Test build-std (x86_64-tvos)	1m 58s
Test (nightly)	1m 59s
Rustfmt	8s
MSRV (windows-latest)	39s
Test (linux32)	2m 2s
MSRV (macos-latest)	29s
Test (macos)	3m 45s
semver-checks	17s
Test (aarch64-macos)	1m 44s
Test (aarch64-ios)	1m 9s
Test (win32)	2m 51s
Test (win64)	3m 36s
Test (mingw32)	2m 44s
Test (mingw64)	3m 3s
Test (windows-2019)	3m 30s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	4m 2s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	5m 17s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	5m 15s
	54m 28s

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