[Flang] Add omp_lib dependency to check-flang (#130975) With `LLVM_ENABLE_RUNTIMES=openmp`, flang enables the OpenMP regression tests, but `check-flang` was not ensuring that the OpenMP requirements are built first. Fix by adding a `libomp-mod` to `flang-test-depends`. Adding `libomp-mod` to extra_targets is necessary because there is no target from openmp/ that is reachable from the parent bootstrapping-build. `ninja openmp` fails because openmp/ has no `openmp` target. `check-openmp` would also run the OpenMP tests and does not even build `omp_lib.mod`. `runtimes` would build all the runtimes, not just OpenMP. Also fix the misleading CMake configure status messages that suggest the only way to build omp_lib.mod/.h is `LLVM_ENABLE_PROJECTS=openmp`.
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