PATCHES: Add DWARF dump to objdump

[Eric Christopher]

>>
>> Do you have more bfd mach-o bits sitting around for some of this?
>>
>>
>
> No, I don't. I don't think the current bfd knows mach-o relocations.
> But it is good enough to dump DWARF info in mach-o executables.

Current bfd doesn't know about mach-o much at all, though the gdb that
Apple ships uses bfd so there's some minimal work in there for
object file reading.

-eric