Core: Implement DSFLIP_SWAP support in dfb_layer_flip_update*()
Core: Implement DSFLIP_SWAP support in dfb_layer_flip_update*()

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