Honor DWCAPS_ALPHACHANNEL for creation of hw window.
Honor DWCAPS_ALPHACHANNEL for creation of hw window.

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