in CreateFont: allow desc == NULL if filename == NULL for default
in CreateFont: allow desc == NULL if filename == NULL for default

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