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965c3d760d
When wrapping a symbol `foo` via `-wrap=foo`, we create the symbol
`__wrap_foo` that replaces all mentions of `foo`. This feature was
implemented for wasm-ld in commit a5ca34e.
So far, no valid signature has been attached to the undefined symbol,
leading to a nullptr dereference in the logic for creating the import
section. This change adds the correct signature to the wrapped symbol,
enabling the generation of an import for it.