[gtk] Fix the build with -Dgtk_doc=true

[Matthias Clasen <matthiasc src gnome org>]

commit 621a427627f2fd95266f4d2169589c3140753aff
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 8 19:04:19 2020 -0500

    Fix the build with -Dgtk_doc=true
    
    We need to export the emoji chooser symbols to
    really make it public api.

 gtk/gtkemojichooser.h | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gtk/gtkemojichooser.h b/gtk/gtkemojichooser.h
index 63670b5d5c..611f4a184b 100644
--- a/gtk/gtkemojichooser.h
+++ b/gtk/gtkemojichooser.h
@@ -35,7 +35,9 @@ G_BEGIN_DECLS
 typedef struct _GtkEmojiChooser      GtkEmojiChooser;
 typedef struct _GtkEmojiChooserClass GtkEmojiChooserClass;
 
+GDK_AVAILABLE_IN_ALL
 GType      gtk_emoji_chooser_get_type (void) G_GNUC_CONST;
+GDK_AVAILABLE_IN_ALL
 GtkWidget *gtk_emoji_chooser_new      (void);
 
 G_END_DECLS