Add support for C/C++ compiler for Neutrino QNX: `qcc` #2115

Job	Run time
Clippy	9s
Test CUDA support	25s
Test build-std (aarch64-tvos)	2m 47s
Test wasm (wasm32-unknown-unknown)	18s
Test build-std (aarch64-tvos-sim)	1m 44s
MSRV (ubuntu-latest)	26s
Test build-std (x86_64-tvos)	1m 45s
Rustfmt	9s
MSRV (windows-latest)	45s
semver-checks	23s
MSRV (macos-latest)	29s
Test wasm32-wasip1-thread	30s
Test (stable)	1m 37s
Test (beta)	1m 18s
Test (nightly)	1m 14s
Test (linux32)	2m 16s
Test (macos)	4m 3s
Test (aarch64-macos)	1m 36s
Test (aarch64-ios)	1m 9s
Test (win32)	2m 41s
Test (win64)	4m 32s
Test (mingw32)	2m 54s
Test (mingw64)	3m 7s
Test (windows-2019)	2m 45s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 59s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	5m 7s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	3m 45s
	51m 53s

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