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This will come in handy if we want to use the LLVM port with a GNU host compiler. As of version 13, libc++ uses `__attribute__((using_if_exists))` to import global LibC functions into the `std` namespace, which allows some symbols to be absent. GCC does not support this attribute, so it fails to build libc++ due to some obscure `wchar.h` functions. This means that cross-compiling libc++ is not possible; and on-target builds would be tedious, so we'll be better off using the toolchain's `libstdc++`.