Treat VxWorks wr-cc as a Gnu compiler #1821

Job	Run time
Test wasm (wasm32-unknown-unknown)	40s
Test build-std (aarch64-tvos)	1m 46s
Test build-std (aarch64-tvos-sim)	2m 2s
Clippy	18s
Test build-std (x86_64-tvos)	1m 47s
Test CUDA support	29s
MSRV (ubuntu-latest)	3m 7s
MSRV (windows-latest)	3m 46s
Rustfmt	10s
MSRV (macos-latest)	3m 12s
semver-checks	2m 19s
Test (stable)	1m 37s
Test (beta)	1m 22s
Test (nightly)	1m 27s
Test (linux32)	1m 41s
Test (macos)	3m 8s
Test (aarch64-macos)	1m 45s
Test (aarch64-ios)	1m 40s
Test (win32)	3m 12s
Test (win64)	3m 59s
Test (mingw32)	3m 19s
Test (mingw64)	3m 14s
Test (windows-2019)	3m 30s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 49s
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 9s
	1h 2m 16s

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