do not build i830 and savage driver if sys/io.h is not available
do not build i830 and savage driver if sys/io.h is not available

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