Fix objdump -g for dwarf

[Ryan Mansfield]

With the addition of -W to objdump, -g no longer works for dwarf because 
the displays were never enabled.

2012-04-06  Ryan Mansfield  <rmansfield@qnx.com>

         * objdump.c (dump_bfd): If defaulting to dwarf call
         dwarf_select_sections_all to enable displays.

Regards,

Ryan Mansfield
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