Linux: Render to main window

[jordm.s]

This option apparently works in the Windows build, but it doesn't seem to have ever been implemented in the Linux build. I'm not a coder, but I know this feature CAN be added because I've seen it done in this project (Snes9x GTK Port: http://www.snes9x.com/phpbb2/viewtopic.php?p=22874). I don't know if it helps, but that project is open source as well, maybe you could look at the code he used and incorporate it into Dolphin.