Graphics: Add missing Flush to dfb_gfx_() functions using client now.
Graphics: Add missing Flush to dfb_gfx_() functions using client now.

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