Better detect when pointer and qualified types carry local changes

Better detect when pointer and qualified types carry local changes

This is a fixup of the previous commit entitled:

    "Better detect when diff nodes only carry local type changes"

In that previous commit, I missed some things about pointer, reference
and qualified types, as far as local changes detection and management
is concerned.

This commit handles those points.

	* src/abg-comparison.cc
	(leaf_diff_node_marker_visitor::visit_begin): Do not mark
	qualified types as leaf diff nodes.
	(redundancy_marking_visitor::visit_end): Changes to qualified type
	are never considered local.  This is just as for pointer and
	reference types.
	* src/abg-default-reporter.cc
	(default_reporter::report_local_reference_type_changes): Display
	structural changes of the pointed-to type.
	(default_reporter::report): In the overload for reference_diff,
	better detect and handle when we have local changes, or not.
	* src/abg-ir.cc (equals): In the overload for qualified_type_def
	and reference_type_de, report local type changes of the underlying
	type as local changes.  Add comments in the overload for pointer
	type, and make it look like the the overload for reference_type.
	* src/abg-leaf-reporter.cc (leaf_reporter::report): In the
	overload for pointer_diff, remove end of line.
	* tests/data/test-diff-filter/libtest45-basic-type-change-report-1.txt: Adjust.
	* tests/data/test-diff-filter/test30-pr18904-rvalueref-report0.txt: Likewise.
	* tests/data/test-diff-filter/test30-pr18904-rvalueref-report1.txt: Likewise.
	* tests/data/test-diff-filter/test30-pr18904-rvalueref-report2.txt: Likewise.
	* tests/data/test-diff-filter/test35-pr18754-no-added-syms-report-0.txt: Likewise.

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