RFC: Change readelf/objdump to automatically follow debug links

[Nick Clifton]

Hi Guys,

  I received a bug report from a Fedora rawhide user[1] that requests
  that the objdump program should follow debug links automatically when
  it is disassembling code.  The request seems reasonable to me, given
  that many distributions these days make use of separate debug info
  files, so I have created the attached patch.

  The patch adds a new configure time option --enable-follow-debugs-links=[yes|no]
  which can be used to set the default behaviour for both objdump and
  readelf.  If the option is not used, the default is to follow the
  links.

  What do people think ?  Any objections to this idea ?

Cheers
  Nick

PS.  Whilst checking for testsuite regressions with the patch I came
  across a bug in objdump's merging of symbol tables from debug info
  files, so the patch includes a fix for this problem too.

[1]: https://bugzilla.redhat.com/show_bug.cgi?id=1926743

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