[PATCH v2] elf: Fix pldd (BZ#18035)

[Florian Weimer]

* Adhemerval Zanella:

>> As discussed before, the makefile dependencies for the chroot generation
>> are incorrect/incomplete, so perhaps pldd in the chroot was not updated
>> properly.
>
> I think I missed this discussion, what is missing here?

Maybe I misunderstood things, but this is what I took away from this
discussion:

  How to debug test-in-container failures?
  <https://sourceware.org/ml/libc-alpha/2019-02/msg00267.html>

Thanks,
Florian