[Flang-RT] Support building no library (#187868) Allow setting both FLANG_RT_ENABLE_SHARED and FLANG_RT_ENABLE_STATIC to OFF at the same time. This is extracted out of #171515 to make that PR a little smaller. By itself it makes little sense since if not building either the `.a` or the `.so`, you are not building anything. But with #171515, the module files are still built, allowing building the modules files without the library. This is mostly intended for GPGPU targets where building the library is not always needed, but the module files are.
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