Release libdwarf 0.6.0

Fixes for Denial Of Service (possible libdwarf crash):

The dealloc required for dwarf_offset_list() was incorrect, possibly leading to a crash.

The function prototype for dwarf_dietype_offset() changed so it can work correctly on DWARF4 objects.

A memory leak from dwarf_load_loclists() has been fixed.

The function dwarf_get_pubtypes() changed, Dwarf_Type no longer exists, correcting a library design mistake made in 1993. The function applied to DWARF3 and DWARF4 objects.

The set of functions using Dwarf_Type are gone, use Dwarf_Global instead.

An object with DW_FORM_strx3 (DWARF5) could result in the library either crashing or returning an inappropriate error. DW_FORM_strx3 is now handled properly.