[llvm-readobj] Support -needed-libs option for Mach-O files

This implements the -needed-libs option in Mach-O dumper.

Differential Revision: https://reviews.llvm.org/D41527

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321980 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed