x11-wm/sway: unbreak WLR_BACKENDS != drm after 3eb7d7b

$ echo 'exec swaymsg -t get_outputs' >/tmp/sway.conf
$ WLR_BACKENDS=headless sway -c /tmp/sway.conf
00:00:00.067 [wlr] [types/wlr_drm_lease_v1.c:716] No DRM backend supplied, failed to create wlr_drm_lease_v1_manager
00:00:00.000 [common/ipc-client.c:87] Unable to receive IPC response
Segmentation fault
(lldb) bt
* thread #1, name = 'sway', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
  * frame #0: 0x000000082b381e84 libc.so.7`strlen + 84
    frame #1: 0x0000000822cc530d libjson-c.so.5`json_object_new_string(s=0x0000000000000000) at json_object.c:1276:36
    frame #2: 0x0000000000234de9 sway`ipc_json_describe_output(output=0x0000000871982200, object=0x00000008755e63b0) at ipc-json.c:255:4
    frame #3: 0x000000000023441f sway`ipc_json_describe_node(node=0x0000000871982200) at ipc-json.c:707:3
    frame #4: 0x0000000000239d07 sway`ipc_client_handle_command(client=0x000000084e3a1380, payload_length=0, payload_type=IPC_GET_OUTPUTS) at ipc-server.c:672:31
    frame #5: 0x00000000002397fa sway`ipc_client_handle_readable(client_fd=27, mask=1, data=0x000000084e3a1380) at ipc-server.c:267:3
    frame #6: 0x00000008271b88c7 libwayland-server.so.0`wl_event_source_fd_dispatch(source=0x000000084e3a16c0, ep=0x0000000820f4e360) at event-loop.c:112:9
    frame #7: 0x00000008271b9fd4 libwayland-server.so.0`wl_event_loop_dispatch(loop=0x000000084e344320, timeout=-1) at event-loop.c:1027:4
    frame #8: 0x00000008271b5c6f libwayland-server.so.0`wl_display_run(display=0x000000084e35e000) at wayland-server.c:1431:3
    frame #9: 0x000000000023e205 sway`server_run(server=0x00000000002a3070) at server.c:310:2
    frame #10: 0x000000000023cd84 sway`main(argc=3, argv=0x0000000820f4e608) at main.c:431:2
    frame #11: 0x000000000022ca10 sway`_start(ap=<unavailable>, cleanup=<unavailable>) at crt1_c.c:75:7
(lldb) f 2
frame #2: 0x0000000000234de9 sway`ipc_json_describe_output(output=0x0000000871982200, object=0x00000008755e63b0) at ipc-json.c:255:4
   252                          json_object_new_string(
   253                                  ipc_json_orientation_description(L_NONE)));
   254          json_object_object_add(object, "make",
-> 255                          json_object_new_string(wlr_output->make));
   256          json_object_object_add(object, "model",
   257                          json_object_new_string(wlr_output->model));
   258          json_object_object_add(object, "serial",
(lldb) p *wlr_output
(wlr_output) $0 = {
[...]
  make = 0x0000000000000000
  model = 0x0000000000000000
  serial = 0x0000000000000000
[...]

PR:		267853
Reported by:	lbartoletti
Regressed by:	https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/be86145322e6

x11-wm/sway/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	sway
 DISTVERSION=	1.7
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	x11-wm wayland
 
 PATCH_SITES=	https://github.com/${GH_ACCOUNT}/${GH_PROJECT}/commit/
@@ -22,6 +22,8 @@ PATCHFILES+=	440d0bc22d57.patch:-p1 # wlroots 0.16
 PATCHFILES+=	6c4c0387a24b.patch:-p1 # wlroots 0.16
 PATCHFILES+=	acdb48a59c26.patch:-p1 # wlroots 0.16
 PATCHFILES+=	3f600565e4dd.patch:-p1 # wlroots 0.16
+PATCHFILES+=	f0d57da315ec.patch:-p1 # wlroots 0.16
+PATCHFILES+=	d0b9bf94a5c6.patch:-p1 # wlroots 0.16
 PATCHFILES+=	26a0e97634dc.patch:-p1 # wlroots 0.16
 PATCHFILES+=	1c69d0e72fe8.patch:-p1 # wlroots 0.16
 PATCHFILES+=	94dbc6a92a03.patch:-p1 # wlroots 0.16

x11-wm/sway/distinfo

@@ -37,6 +37,10 @@ SHA256 (acdb48a59c26.patch) = a1bcb9cfe917d0b4fe44785a2ac833b223e0e17517f9b8e29f
 SIZE (acdb48a59c26.patch) = 2848
 SHA256 (3f600565e4dd.patch) = 326ca734e8eef7fc2f23ef63f5ec7c693e17c159b8c71ca0e3d17d99f17538e6
 SIZE (3f600565e4dd.patch) = 1355
+SHA256 (f0d57da315ec.patch) = 24ebd3eca91e551365331c67c56b5ed855c96855052c9f862281b806869cca2f
+SIZE (f0d57da315ec.patch) = 4552
+SHA256 (d0b9bf94a5c6.patch) = 17a0704b661fba5b09d7a5c1d5f554d61bf32a566a1780d8cfb2056748494f54
+SIZE (d0b9bf94a5c6.patch) = 1979
 SHA256 (26a0e97634dc.patch) = 92660c130ec41158383438afe32f32244ef2506d6f6d306a1ba64c2ac1cda4e5
 SIZE (26a0e97634dc.patch) = 2175
 SHA256 (1c69d0e72fe8.patch) = df8f1ed38b3570eefaa9a3ea0a8e1d66e3234e2f09e70b1930c903dc56a5a033