Fix objdump -g for dwarf

[nick clifton]

Hi Ryan,

> 2012-04-06 Ryan Mansfield <rmansfield@qnx.com>
>
> * objdump.c (dump_bfd): If defaulting to dwarf call
> dwarf_select_sections_all to enable displays.

Approved and applied - thanks for spotting and fixing this.

Cheers
   Nick