Correctly handle fn DIE with abstract_origin in alt debug info

Correctly handle fn DIE with abstract_origin in alt debug info

When a function decl DIE is in the main DWARF file but has an abstract
origin that is in the alternate DWARF file, the dwarf reader
mistakenly considers the resulting function decl as being for a DIE
that is in the alternate DWARF file.

Fixed thus.

	* src/abg-dwarf-reader.cc (build_ir_node_from_die): Consider that
	the function decl is for a DIE in the alternate debug info file only if
	the DIE itself comes from the alternate debug info file, not if
	the specification or the origin of the function comes from the
	alternate debug info file.
	* tests/data/test-diff-pkg/qemu-img-rhev-2.3.0-20.el7.ppc64.rpm:
	New test input rpm.
	* tests/data/test-diff-pkg/qemu-img-rhev-2.3.0-7.el7.ppc64.rpm: Likewise.
	* tests/data/test-diff-pkg/qemu-kvm-rhev-debuginfo-2.3.0-20.el7.ppc64.rpm: Likewise.
	* tests/data/test-diff-pkg/qemu-kvm-rhev-debuginfo-2.3.0-7.el7.ppc64.rpm: Likewise.
	* tests/data/test-diff-pkg/qemu-img-rhev-2.3.0-7.el7.ppc64--qemu-img-rhev-2.3.0-20.el7.ppc64-report-0.txt:
	New test reference output.
	* tests/data/Makefile.am: Add the new test material to the source
	distribution.
	* tests/test-diff-pkg.cc (in_out_specs): Use the new test rpm
	inputs.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>