Pass O_CLOEXEC to drmModeCreateLease calls

The lease_fd is currently being leaked to child processes

Link: https://github.com/swaywm/sway/issues/4286#issuecomment-1065987957

backend/drm/drm.c

@@ -1629,7 +1629,7 @@ struct wlr_drm_lease *wlr_drm_create_lease(struct wlr_output **outputs,
 	wl_signal_init(&lease->events.destroy);
 
 	wlr_log(WLR_DEBUG, "Issuing DRM lease with %d objects", n_objects);
-	int lease_fd = drmModeCreateLease(drm->fd, objects, n_objects, 0,
+	int lease_fd = drmModeCreateLease(drm->fd, objects, n_objects, O_CLOEXEC,
 			&lease->lessee_id);
 	if (lease_fd < 0) {
 		free(lease);

render/allocator/allocator.c

@@ -30,7 +30,7 @@ static int reopen_drm_node(int drm_fd, bool allow_render_node) {
 	if (drmIsMaster(drm_fd)) {
 		// Only recent kernels support empty leases
 		uint32_t lessee_id;
-		int lease_fd = drmModeCreateLease(drm_fd, NULL, 0, 0, &lessee_id);
+		int lease_fd = drmModeCreateLease(drm_fd, NULL, 0, O_CLOEXEC, &lessee_id);
 		if (lease_fd >= 0) {
 			return lease_fd;
 		} else if (lease_fd != -EINVAL && lease_fd != -EOPNOTSUPP) {