Only use GLOB_DAT for GOT entries #593
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The ELF spec says that GLOB_DAT resolves to the address of the symbol and doesn't mention applying any addend. Some runtimes do apply an addend, but we can't rely on that. So only use GLOB_DAT for GOT entries, which don't have an addend. For other absolute symbol relocations, use R_x86_64_64. Fixes #576
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Fixes #576