remoting: make sure GL renderer is enabled

The remoting plug-in requires DRM virtual support which depends on
the GL renderer. Make sure the option is enabled.

Signed-off-by: Stefan Agner <stefan@agner.ch>

remoting/meson.build

@@ -1,8 +1,8 @@
 if get_option('remoting')
 	user_hint = 'If you rather not build this, set \'-Dremoting=false\'.'
 
-	if not get_option('backend-drm')
-		error('Attempting to build the remoting plugin without the required DRM backend. ' + user_hint)
+	if not get_option('backend-drm') or not get_option('renderer-gl')
+		error('Attempting to build the remoting plugin without the required DRM backend and GL renderer. ' + user_hint)
 	endif
 
 	depnames = [