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The version script didn't account for symbols disabled by configuration options. This has caused problems on some OSs in the past and breaks lld 16 which enables --no-undefined-version by default. A proper fix would be rather involved, so we simply remove all symbols from the version script. This is an ELF-only feature and libxml2 never made use of symbol versioning anyway. Ultimately, this removes the need for a lot of bookkeeping without tangible benefits. We have to keep the version nodes to avoid errors when running binaries linked against older versions of libxml2. Fixes #473.