Fixing AGI Game Detection
|Reported by:||SF/metafox||Owned by:||sev-|
VIEWDIR is not the common file among AGI games. That would be OBJECT.
King's Quest IV is detected and works fine when OBJECT is used as the common base for AGI games. When it is not, it is not detected due to the game not having a VIEWDIR file.
Ticket imported from: #1512689. Ticket imported from: patches/655.