Tweak llvm-nm’s -undefined-only (aka -u) printing for Mach-O files
to just print the symbol name.  So it matches darwin’s nm(1) -u option.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214143 91177308-0d34-0410-b5e6-96231b3b80d8