Add coverage for freestanding (#49) #101

Job	Run time
Run BVT with MSVC / bvt-msvc	14m 9s
Run BVT for lint / bvt-lint	34s
Run BVT with Clang / bvt-clang	13m 22s
Run BVT for compatibility / clang-20	3m 25s
Run BVT with NVHPC / bvt-nvhpc	20m 3s
Run BVT with GCC / bvt-gcc	10m 45s
Run BVT for compatibility / gcc-13	1m 50s
Run BVT with AppleClang / bvt-appleclang	11m 6s
Run BVT for compatibility / clang-21	3m 30s
Run BVT for compatibility / clang-19	3m 18s
Run BVT for compatibility / gcc-14	1m 58s
Run BVT for compatibility / clang-18	2m 48s
Run BVT for compatibility / clang-17	3m 7s
Run BVT with Intel oneAPI / bvt-oneapi	11m 32s
Run BVT for compatibility / clang-16	2m 19s
Generate report / bvt-report	33s
	1h 44m 19s

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