backend-drm: build DRM virtual support when the pipewire plugin is enabled

The pipewire plugin uses this API as well, not just the remoting plugin. So
enable it if either is enabled.

And disable pipewire in the no-gl-renderer CI build. The virtual outputs don't
work without it.

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>

.gitlab-ci.yml

@@ -92,6 +92,7 @@ build-native-meson-no-gl-renderer:
       -Dsimple-clients=damage,im,shm,touch,dmabuf-v4l
       -Drenderer-gl=false
       -Dremoting=false
+      -Dpipewire=false
       -Dwerror=true
   extends: .build-native-meson
 

libweston/backend-drm/meson.build

@@ -71,7 +71,7 @@ if get_option('backend-drm-screencast-vaapi')
 	config_h.set('BUILD_VAAPI_RECORDER', '1')
 endif
 
-if get_option('remoting')
+if get_option('remoting') or get_option('pipewire')
 	if not get_option('renderer-gl')
 		warning('DRM virtual requires renderer-gl.')
 	endif