kms-impl-device: Use portable formatting for 64-bit integers

On 64-bit systems uint64_t is %lu but on 32-bit systems it is %llu.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/778

src/backends/native/meta-kms-impl-device.c

@@ -266,7 +266,8 @@ get_plane_type (MetaKmsImplDevice       *impl_device,
     case DRM_PLANE_TYPE_OVERLAY:
       return META_KMS_PLANE_TYPE_OVERLAY;
     default:
-      g_warning ("Unhandled plane type %lu", props->prop_values[idx]);
+      g_warning ("Unhandled plane type %" G_GUINT64_FORMAT,
+                 props->prop_values[idx]);
       return -1;
     }
 }