[gtk/a11y/atspi] Fix compiler warnings

[Matthias Clasen <matthiasc src gnome org>]

commit d0753f645ec80f81b82235927bac3e91740fe6f0
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Oct 13 15:08:32 2020 -0400

    Fix compiler warnings

 gtk/a11y/gtkatspicontext.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtk/a11y/gtkatspicontext.c b/gtk/a11y/gtkatspicontext.c
index 6e4cfdf2c2..89612a14eb 100644
--- a/gtk/a11y/gtkatspicontext.c
+++ b/gtk/a11y/gtkatspicontext.c
@@ -1071,11 +1071,11 @@ gtk_at_spi_context_constructed (GObject *gobject)
 
   GtkAccessible *accessible = gtk_at_context_get_accessible (GTK_AT_CONTEXT (self));
   gtk_atspi_connect_text_signals (GTK_WIDGET (accessible),
-                                  emit_text_changed,
-                                  emit_text_selection_changed,
+                                  (GtkAtspiTextChangedCallback *)emit_text_changed,
+                                  (GtkAtspiTextSelectionCallback *)emit_text_selection_changed,
                                   self);
   gtk_atspi_connect_selection_signals (GTK_WIDGET (accessible),
-                                       emit_selection_changed,
+                                       (GtkAtspiSelectionCallback *)emit_selection_changed,
                                        self);
   gtk_at_spi_context_register_object (self);