gfxcard: support clipping for vertical and horizontal flips
gfxcard: support clipping for vertical and horizontal flips

this does not work in combination with DSBLIT_ROTATE_ flags yet.
The software driver cant combine DSBLIT_FLIP_ and DSBLIT_ROTATE_ anyway,
correct clipping here would cause a segfault in generic.c.

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