x11: Drop error trap helpers

They are no longer that useful as they end up calling
mtk functions nowadays

Followup of https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3230

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3483>

src/backends/meta-monitor-manager.c

@@ -60,7 +60,6 @@
 #include "core/util-private.h"
 #include "meta/main.h"
 #include "meta/meta-enum-types.h"
-#include "meta/meta-x11-errors.h"
 
 #include "meta-dbus-display-config.h"
 

src/backends/native/meta-monitor-manager-native.c

@@ -57,7 +57,6 @@
 #include "backends/native/meta-virtual-monitor-native.h"
 #include "clutter/clutter.h"
 #include "meta/main.h"
-#include "meta/meta-x11-errors.h"
 
 #include "meta-dbus-display-config.h"
 

src/backends/x11/meta-backend-x11.c

@@ -57,7 +57,7 @@
 #include "core/display-private.h"
 #include "meta/meta-cursor-tracker.h"
 #include "meta/util.h"
-#include "mtk/mtk-x11-errors.h"
+#include "mtk/mtk-x11.h"
 
 struct _MetaBackendX11Private
 {

src/backends/x11/meta-cursor-tracker-x11.c

@@ -22,7 +22,6 @@
 
 #include "backends/x11/cm/meta-cursor-sprite-xfixes.h"
 #include "clutter/clutter-private.h"
-#include "meta/meta-x11-errors.h"
 #include "x11/meta-x11-display-private.h"
 
 #define UPDATE_POSITION_TIMEOUT_MS (ms (100))

src/backends/x11/meta-stage-x11.c

@@ -39,7 +39,6 @@
 #include "cogl/cogl.h"
 #include "core/display-private.h"
 #include "meta/meta-context.h"
-#include "meta/meta-x11-errors.h"
 
 #define STAGE_X11_IS_MAPPED(s)  ((((MetaStageX11 *) (s))->wm_state & STAGE_X11_WITHDRAWN) == 0)