[openmp][NFCI] Move .mod code out of runtimes subdir (#169909) Extracted out of #169638. The motivation is that we want to build Fortran module files for device triples (amdgpu-amd-amdhsa and nvptx64-nvidia-cuda) as well, but the runtimes/ directory is only included for host devices. This PR itself should not change anything, including that omp_lib.mod is only built on host devices triple. Some dependencies used for building omp_lib.mod are hoisted out of runtimes/ as well. IMHO they all make sense to hoist, e.g. LIBOMP_VERSION_MAJOR/LIBOMP_VERSION_MINOR should be usable in the entire OpenMP subproject.
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