fix Issue 10274

- Elf64 uses only the explicit addends of a relocation.
  It seems like ld.bfd still adds the value at the to be
  relocated address, but ld.gold does not.
Merge pull request #2164 from dawgfoto/fix10724

fix Issue 10274 - DMD 2.063 produces broken binaries
better bugfix comment
Merge pull request #2171 from dawgfoto/fix10274

better bugfix comment