libdw: dwarf_aggregate_size return CU address_size for sizeless pointer/refs.

Tested-by: Conrad Meyer <cse.cem@gmail.com>
Signed-off-by: Mark Wielaard <mjw@redhat.com>
tests: run-deleted.sh unset VALGRIND_CMD before running deleted.

We don't want to run the deleted test process under valgrind then
eu-stack will see the valgrind process backtrace.

Signed-off-by: Mark Wielaard <mjw@redhat.com>
dwarf.h: Add DW_AT_GNU_deleted.

DW_AT_GNU_deleted is added by G++ for C++11 deleted special member
functions (= delete;). This is a constant only addition to dwarf.h.
No other part of elfutils currently depends on this attribute.
Also added to https://fedorahosted.org/elfutils/wiki/DwarfExtensions

Signed-off-by: Mark Wielaard <mjw@redhat.com>