Building with Travis CL

[myhrman]

Just linking to a similar issue on macOS:

OS X: Running Projucer from headless console / ssh

We use Projucer to re-generate project files automatically in our continuous integration builds. However, attempting to run Projucer via a headless console on OS X prints a number of error messages: Projucer : Set a breatpoint at CGSLogError to catch errors as they are logged. Projucer : This user is not allowed access to the window system right now. _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL. Projucer : CGSConnecti…