Updates an array of accessible relations.
This function should be called by `GtkWidget` types whenever an accessible relation change must be communicated to assistive technologies.
This function is meant to be used by language bindings.
| this |
a `GtkAccessible` |
| relations |
an array of `GtkAccessibleRelation` |
| values |
an array of `GValues`, one for each relation |
| n_relations |
the number of accessible relations to set |