libdwarf: (bugfix) add a change inadvertently missed in [r4046].
libdwarf: fix inconsistent usage of calloc(3).
libdwarf: Avoid assigning undefined values to a structure member.
libdwarf: Fix a potential memory leak.
Unbreak the 'test' target for 'ar' and 'elfcopy'.
Bug-fix: unbreak the 'test' target within program/library directories.
Catch up with the directory reorganisation in [r4029].
Does Not Build on Cygwin -- ELFTC_VCSID not defined