cmake: build dfbegl_core_x11
cmake: build dfbegl_core_x11

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