Code review comment for lp:~cemil-azizoglu/mir/use-options-to-probe

IIUC, currently we have:

host platforms:
./mir_demo_server

guest platforms:
./mir_demo_server --host-server
./mir_demo_server --offscreen

With this branch, it becomes a bit more special-cased:

host platforms:
[android] ./mir_demo_server
[mesa] ./mir_demo_server --vt X

guest platforms:
[mesa] ./mir_demo_server
./mir_demo_server --host-server
./mir_demo_server --offscreen

Couldn't we have a mesa-specific option:
./mir_demo_server --x11-display :0.0
so that the host platforms are just the option-less versions?