RFC: Change readelf/objdump to automatically follow debug links

[Florian Weimer]

* Nick Clifton:

>   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 happens if the debuglink contains '/'?  Maybe it's prudent to
restrict loading of debuginfo data if it comes from the system default
location.

Thanks for looking into this,
Florian
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