added gdt descriptor struct
added gdt descriptor struct

tedsta/redox,vvlevchenko/redox,nxnfufunezn/redox,nounoursheureux/redox,vvlevchenko/redox,imp/redox,nounoursheureux/redox,nxnfufunezn/redox,vvlevchenko/redox,achanda/redox,tedsta/redox,nxnfufunezn/redox,achanda/redox,imp/redox,imp/redox,achanda/redox,tedsta/redox,tedsta/redox,nounoursheureux/redox