this would fix undefined symbol errors by making it clear these functions are imported. references: https://github.com/llvm/llvm-project/blob/e2c698c7e836306f1a25c67597ae9e25a1fcc575/llvm/lib/MC/WasmObjectWriter.cpp#L1798-L1799 https://github.com/llvm/llvm-project/blob/e2c698c7e836306f1a25c67597ae9e25a1fcc575/llvm/lib/Object/WasmObjectFile.cpp#L749-L752 https://github.com/llvm/llvm-project/blob/e2c698c7e836306f1a25c67597ae9e25a1fcc575/lld/wasm/Symbols.cpp#L203 https://github.com/llvm/llvm-project/blob/e2c698c7e836306f1a25c67597ae9e25a1fcc575/lld/wasm/Relocations.cpp#L36-L40