MachO: fix dynamic lookup of undefined symbols at runtime #26042
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Ensures `MH_NOUNDEFS` is not set when dynamic lookup is enabled for undefined symbols via `linker_allow_shlib_undefined`.
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While writing DuckDB extensions in Zig, I noticed that
linker_allow_shlib_undefineddoesn't work as intended on macOS.This PR ensures
MH_NOUNDEFSis not set when dynamic lookup is enabled for undefined symbols.