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Otherwise, we would end up passing `-lNOTFOUND` to the compiler, which caused various compiler checks to fail and ended up breaking the build in the most obscure ways. For example, checks for -faligned-allocation would fail because the compiler would complain about an unknown library called NOTFOUND, and we would end up not passing -faligned-allocation anywhere in our build. This is madness. An even better alternative would be to simply FATAL_ERROR if we don't find the builtins library. However, it seems like our build has been working fine without finding it for a while, so instead of making a bunch of builds fail, we can figure out why linking against compiler-rt doesn't actually seem to be required in a follow-up, and perhaps relax that.