cleanup: Make GDK dependency specific to X11

This way, the dependencies on GTK/GDK could be completely dropped if
built with Wayland only.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2407>

src/backends/x11/meta-input-settings-x11.c

@@ -25,7 +25,6 @@
 
 #include "backends/x11/meta-input-settings-x11.h"
 
-#include <gdk/gdkx.h>
 #include <string.h>
 #include <X11/Xatom.h>
 #include <X11/extensions/XInput2.h>

src/compositor/meta-dnd.c

@@ -21,8 +21,6 @@
 
 #include "compositor/meta-dnd-private.h"
 
-#include <gdk/gdkx.h>
-
 #include "meta/meta-backend.h"
 #include "compositor/compositor-private.h"
 #include "core/display-private.h"

src/compositor/meta-shaped-texture.c

@@ -38,7 +38,6 @@
 #include "compositor/meta-shaped-texture-private.h"
 #include "core/boxes-private.h"
 
-#include <gdk/gdk.h>
 #include <math.h>
 
 #include "cogl/cogl.h"
@@ -785,7 +784,7 @@ do_paint_content (MetaShapedTexture   *stex,
               cairo_rectangle_int_t rect;
               cairo_region_get_rectangle (blended_tex_region, i, &rect);
 
-              if (!gdk_rectangle_intersect (&content_rect, &rect, &rect))
+              if (!meta_rectangle_intersect (&content_rect, &rect, &rect))
                 continue;
 
               paint_clipped_rectangle_node (stex, root_node,

src/compositor/meta-window-actor.c

@@ -21,7 +21,6 @@
 
 #include "config.h"
 
-#include <gdk/gdk.h>
 #include <math.h>
 #include <string.h>
 

src/compositor/meta-window-group.c

@@ -2,7 +2,6 @@
 
 #include "config.h"
 
-#include <gdk/gdk.h>
 #include <math.h>
 
 #include "compositor/clutter-utils.h"

src/core/place.c

@@ -26,7 +26,6 @@
 
 #include "core/place.h"
 
-#include <gdk/gdk.h>
 #include <math.h>
 #include <stdlib.h>
 

src/meta/common.h

@@ -29,7 +29,6 @@
 #include <X11/extensions/XInput.h>
 #include <X11/extensions/XInput2.h>
 #include <glib.h>
-#include <gtk/gtk.h>
 
 #include "clutter/clutter.h"
 #include "meta/meta-enums.h"

src/x11/meta-x11-display-private.h

@@ -26,6 +26,7 @@
 #define META_X11_DISPLAY_PRIVATE_H
 
 #include <glib.h>
+#include <gdk/gdk.h>
 #include <X11/Xlib.h>
 
 #include "backends/meta-monitor-manager-private.h"