[patch] Fix BZ 23187 -- stack overflow for many Phdr[]s

[Florian Weimer]

* Adhemerval Zanella:

> What about use dynarray for this as below.  The initial sizes are still
> arbitraty and should cover most common cases, but I do not have a strong
> opinion here (they have total stack usage of 384 bytes for loadcmd_list
> and 896 for phdr_list on 64 bits architectures).

dynarray is not compatible with the dl-minimal.c malloc implementation.
realloc in particular contains this:

  assert (ptr == alloc_last_block);