Added WaitVSync() to video overlay.
Added WaitVSync() to video overlay.

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