Move MetaDrmTimeline to src/common

There's nothing Wayland specific about it.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3876>

src/common/meta-drm-timeline.c

@@ -37,8 +37,8 @@
 #include <sys/eventfd.h>
 #endif
 
+#include "common/meta-drm-timeline.h"
 #include "meta/util.h"
-#include "wayland/meta-drm-timeline.h"
 
 enum
 {

src/meson.build

@@ -585,8 +585,6 @@ if have_wayland
     'core/meta-service-channel.h',
     'wayland/meta-cursor-sprite-wayland.c',
     'wayland/meta-cursor-sprite-wayland.h',
-    'wayland/meta-drm-timeline.c',
-    'wayland/meta-drm-timeline.h',
     'wayland/meta-pointer-confinement-wayland.c',
     'wayland/meta-pointer-confinement-wayland.h',
     'wayland/meta-pointer-lock-wayland.c',
@@ -894,6 +892,8 @@ if have_wayland or have_native_backend
     'common/meta-cogl-drm-formats.h',
     'common/meta-drm-format-helpers.c',
     'common/meta-drm-format-helpers.h',
+    'common/meta-drm-timeline.c',
+    'common/meta-drm-timeline.h',
   ]
 endif
 

src/wayland/meta-wayland-buffer.c

@@ -58,8 +58,8 @@
 #include "wayland/meta-wayland-private.h"
 #include "common/meta-cogl-drm-formats.h"
 #include "common/meta-drm-format-helpers.h"
+#include "common/meta-drm-timeline.h"
 #include "compositor/meta-multi-texture-format-private.h"
-#include "wayland/meta-drm-timeline.h"
 #include "wayland/meta-wayland-linux-drm-syncobj.h"
 
 #ifdef HAVE_NATIVE_BACKEND

src/wayland/meta-wayland-linux-drm-syncobj.h

@@ -22,8 +22,8 @@
 
 #include <glib.h>
 
+#include "common/meta-drm-timeline.h"
 #include "wayland/meta-wayland-types.h"
-#include "wayland/meta-drm-timeline.h"
 
 #include "linux-drm-syncobj-v1-server-protocol.h"