[mutter/gbsneto/graphene-frustrum: 15/26] clutter: Remove ClutterPlane

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 19d4706eeb6780565aae0b7d7b8c58ee9375fac7
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri Oct 9 16:38:10 2020 -0300

    clutter: Remove ClutterPlane
    
    It is unused now.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1489

 clutter/clutter/clutter-private.h | 6 ------
 1 file changed, 6 deletions(-)
---
diff --git a/clutter/clutter/clutter-private.h b/clutter/clutter/clutter-private.h
index 594a73b862..8d85a61c0e 100644
--- a/clutter/clutter/clutter-private.h
+++ b/clutter/clutter/clutter-private.h
@@ -245,12 +245,6 @@ PangoDirection _clutter_pango_unichar_direction (gunichar ch);
 PangoDirection _clutter_pango_find_base_dir     (const gchar *text,
                                                  gint         length);
 
-typedef struct _ClutterPlane
-{
-  graphene_vec3_t v0;
-  graphene_vec3_t n;
-} ClutterPlane;
-
 typedef enum _ClutterCullResult
 {
   CLUTTER_CULL_RESULT_UNKNOWN,