[OpenMP][CMake] Revert standalone build LIBOMP_HEADERS_INSTALL_PATH #91243
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Revert the portion of #75125 which modified the LIBOMP_HEADERS_INSTALL_PATH in standalone build.
This change is harmful for real standalone builds (i.e. builds where we build openmp by itself), since it tries to overwrite the
omp.h
inside the build compiler. For all-in-one builds with clang, testing shows this change is unnecessary as #88007 already set up that build configuration so that omp.h will be put into the project build'sclang
resource directory.