examples: add libdrm partial dependency for compositors

Fixes: 675bc39658 ("Fix wl_shm_format passed to wlr_texture_from_pixels")

examples/meson.build

@@ -8,6 +8,8 @@ glesv2 = dependency('glesv2', required: false, disabler: true)
 libavutil = dependency('libavutil', version: '>=56.14.100', required: false, disabler: true)
 libavcodec = dependency('libavcodec', version: '>=58.18.100', required: false, disabler: true)
 libavformat = dependency('libavformat', version: '>=58.12.100', required: false, disabler: true)
+# Only needed for drm_fourcc.h
+libdrm = dependency('libdrm').partial_dependency(compile_args: true, includes: true)
 
 # epoll is a separate library in FreeBSD
 if host_machine.system() == 'freebsd'
@@ -191,7 +193,7 @@ foreach name, info : compositors
 	executable(
 		name,
 		[info.get('src'), extra_src],
-		dependencies: wlroots,
+		dependencies: [wlroots, libdrm],
 		include_directories: [wlr_inc, proto_inc],
 		build_by_default: get_option('examples'),
 	)