Current implementation links these libraries under all circumstances. However, for libc-free programming these libraries are redundant. This is one of the show stoppers toward `dmd`-based libc-free programming without invoking `cc` manually. Another is https://github.com/dlang/dmd/pull/794. Related code: https://github.com/dlang/dmd/blob/6371942b1bf26dc6c65cc7e0668bc82e1974c18d/src/dmd/link.d#L652
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