tools: Add gendwarfksyms

Add a basic DWARF parser, which uses libdw to traverse the debugging
information in an object file and looks for functions and variables.
In follow-up patches, this will be

tools: Add gendwarfksyms

Add a basic DWARF parser, which uses libdw to traverse the debugging
information in an object file and looks for functions and variables.
In follow-up patches, this will be expanded to produce symbol versions
for CONFIG_MODVERSIONS from DWARF.

Signed-off-by: Sami Tolvanen <[email protected]>
Reviewed-by: Petr Pavlu <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>

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