ELF: alias `--no-copy-dt-needed-entries` to `--no-add-needed`

`--add-needed` and `--no-add-needed` have been deprecated due to the similarity
of their spelling to `--as-needed` and `--no-as-needed`.  They have been renamed
to `--copy-dt-needed-entries` and `--no-copy-dt-needed-entries`.

llvm-svn: 267031