Code review comment for lp:~raof/mir/the-least-dirty-thing

Clients wanting to use the debug extensions link against libmirclient as normal, and *also* libmirclient-debug-extension. There's no duplication of source code, just duplication of object code (as libmirclient-debug-extension needs access to the MirSurface implementation).

Andreas: Urgh, yeah, I guess so. I _think_ we have enough information in the nested case to do the translation without bouncing up to the host server, but it'll be safer to do so, yeah.