atspi: Add the AtspiRelationType enum

This is what we need to map the aria relation
types to.

gtk/a11y/gtkatspiprivate.h

@@ -205,5 +205,27 @@ typedef enum {
   ATSPI_STATE_LAST_DEFINED,
 } AtspiStateType;
 
+typedef enum {
+    ATSPI_RELATION_NULL,
+    ATSPI_RELATION_LABEL_FOR,
+    ATSPI_RELATION_LABELLED_BY,
+    ATSPI_RELATION_CONTROLLER_FOR,
+    ATSPI_RELATION_CONTROLLED_BY,
+    ATSPI_RELATION_MEMBER_OF,
+    ATSPI_RELATION_TOOLTIP_FOR,
+    ATSPI_RELATION_NODE_CHILD_OF,
+    ATSPI_RELATION_NODE_PARENT_OF,
+    ATSPI_RELATION_EXTENDED,
+    ATSPI_RELATION_FLOWS_TO,
+    ATSPI_RELATION_FLOWS_FROM,
+    ATSPI_RELATION_SUBWINDOW_OF,
+    ATSPI_RELATION_EMBEDS,
+    ATSPI_RELATION_EMBEDDED_BY,
+    ATSPI_RELATION_POPUP_FOR,
+    ATSPI_RELATION_PARENT_WINDOW_OF,
+    ATSPI_RELATION_DESCRIPTION_FOR,
+    ATSPI_RELATION_DESCRIBED_BY,
+    ATSPI_RELATION_LAST_DEFINED,
+} AtspiRelationType;
 
 G_END_DECLS