analyzer/text-art: fix clang warnings [PR110433,PR110612]

analyzer/text-art: fix clang warnings [PR110433,PR110612]

gcc/analyzer/ChangeLog:
	PR analyzer/110433
	PR middle-end/110612
	* access-diagram.cc (class spatial_item): Add virtual dtor.

gcc/ChangeLog:
	PR middle-end/110612
	* text-art/table.cc (table_geometry::table_geometry): Drop m_table
	field.
	(table_geometry::table_x_to_canvas_x): Add cast to comparison.
	(table_geometry::table_y_to_canvas_y): Likewise.
	* text-art/table.h (table_geometry::m_table): Drop unused field.
	* text-art/widget.h (wrapper_widget::update_child_alloc_rects):
	Add "override".

Signed-off-by: David Malcolm <dmalcolm@redhat.com>