There's a forthcoming enhancement to roswtf to warn on the presence of
these flags: https://code.ros.org/trac/ros/ticket/3221.

roswtf should already warn in this case, something like:


WARNING The following packages have msg/srv-related cflags exports that are no longer necessary
	<export>
		<cpp cflags="..."
	</export>:
 * visualization_msgs: -I${prefix}/msg/cpp

Josh