[Support/ELF] Remove field erroneously added in r258025.

Although glibc defines it, this is currently of no use for my primary
use-case (dumping DT_* keys correctly). Its semantic is not described
anywhere I can find, so better leave it out for now.
Thanks to Rafael for pointing out in his post-commit review!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258089 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed