Added duff's device for 8 bit color keying.
Added duff's device for 8 bit color keying.

sklnet/DirectFB,kevleyski/DirectFB-1,kevleyski/directfb,mtsekm/test,mtsekm/test,jcdubois/DirectFB,deniskropp/DirectFB,Distrotech/DirectFB,Distrotech/DirectFB,sklnet/DirectFB,kaostao/directfb,kevleyski/directfb,kaostao/directfb,dfbdok/DirectFB1,kevleyski/DirectFB-1,sklnet/DirectFB,kevleyski/directfb,djbclark/directfb-core-DirectFB,djbclark/directfb-core-DirectFB,DirectFB/directfb,deniskropp/DirectFB,mtsekm/test,DirectFB/directfb,deniskropp/DirectFB,dfbdok/DirectFB1,Distrotech/DirectFB,lancebaiyouview/DirectFB,kaostao/directfb,kevleyski/DirectFB-1,djbclark/directfb-core-DirectFB,jcdubois/DirectFB,jcdubois/DirectFB,deniskropp/DirectFB,dfbdok/DirectFB1,sklnet/DirectFB,DirectFB/directfb,kevleyski/DirectFB-1,lancebaiyouview/DirectFB,djbclark/directfb-core-DirectFB,kevleyski/directfb,lancebaiyouview/DirectFB,lancebaiyouview/DirectFB