added missing include - required to compile with dietlibc
added missing include - required to compile with dietlibc

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