[padb] edb fixes

[Duncan Thomas]

The version of edb in padb, which matches the one currently shipped by
Vega, doesn't work (specifically, queue extraction doesn't work since
the elf reading code can no longer find elan_base). 

The issue seems to be that libelan4.so no longer has a DT_HASH, so you
have to walk the symbol table in a linear manner. It was also running
into a DT_HASH it couldn't work with in an unnamed dynamic section. The
new code just skips unnamed sections since they never contain what we
want.

I'm not sure the new code is 100% correct, but it seems to work unlike
what was there before. Comments off people who understand elf structures
better very welcome.

These fixes should find their way into the next Vega release unless
problems with them are found.

 <<edb_fixes_2010_11_09.diff>> 

-- 
Duncan Thomas
HPC Consultant

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