[lld] [lld] Add target support for SystemZ (s390x) (PR #75643)

[Ulrich Weigand via llvm-commits]

uweigand wrote:

Well, this seems bogus:
```
  Type:                              <unknown>: 103
```
`e_type` should be `ET_REL` or something, but not some undefined value.  How did that happen?


https://github.com/llvm/llvm-project/pull/75643