[lld] [lld][WebAssembly] Fix use of undefined funcs under --warn-unresolved-symbols (PR #78643)

[Felipe de Azevedo Piovezan via llvm-commits]

felipepiovezan wrote:

This windows test started failing: https://lab.llvm.org/buildbot/#/builders/42/builds/13006
Might be related?

https://github.com/llvm/llvm-project/pull/78643