feat: add i686-pc-windows-gnullvm prefix detection #2013

Job	Run time
Test build-std (aarch64-tvos)	1m 55s
Test (stable)	1m 25s
Clippy	8s
Test wasm (wasm32-unknown-unknown)	18s
Test (beta)	1m 59s
Test (nightly)	1m 51s
Test build-std (aarch64-tvos-sim)	2m 25s
Test (linux32)	2m 1s
Test CUDA support	1m 23s
MSRV (ubuntu-latest)	28s
Test build-std (x86_64-tvos)	1m 59s
Test (macos)	3m 9s
MSRV (windows-latest)	40s
MSRV (macos-latest)	36s
Test (aarch64-macos)	1m 29s
semver-checks	2m 20s
Test (aarch64-ios)	1m 13s
Rustfmt	14s
Test wasm32-wasip1-thread	36s
Test (win32)	2m 39s
Test (win64)	2m 20s
Test (mingw32)	2m 57s
Test (mingw64)	3m 5s
Test (windows-2019)	3m 35s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 43s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	4m 29s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	4m 28s
	53m 25s

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