Jakub Konka a88c0b4d08 link: handle -u flag in all linkers ...

Also clean up parsing of linker args - reuse `ArgsIterator`.

In MachO, ensure we add every symbol marked with `-u` as undefined
before proceeding with symbol resolution. Additionally, ensure those
symbols are never garbage collected.

MachO entry_in_dylib test: pass `-u _my_main` when linking executable
so that it is not incorrectly garbage collected by the linker.

2023-04-01 14:22:44 +02:00

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