Change libLTO back to linking with @executable_path instead of @rpath.

This partially reverts r187641 until ld64 adopts a change to link with an
rpath setting.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194418 91177308-0d34-0410-b5e6-96231b3b80d8
Add support for DT_VERxxx and DT_MIPS_xxx .dynamic section entries to the
llvm-readobj.

The patch reviewed by Michael Spencer.
http://llvm-reviews.chandlerc.com/D2113

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194421 91177308-0d34-0410-b5e6-96231b3b80d8