IDirectFBWindow: Add DWOP_STEREO_SIDE_BY_SIDE_HALF to have stereo output without changing buffers.
IDirectFBWindow: Add DWOP_STEREO_SIDE_BY_SIDE_HALF to have stereo output without changing buffers.

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