vstruct/primitives.py: fix typo, s/struck/struct/
vstruct/primitives.py: fix typo, s/struck/struct/

joshuahoman/vivisect,pwns4cash/vivisect,bat-serjo/vivisect,bat-serjo/vivisect,atlas0fd00m/vivisect,imjonsnooow/vivisect,pwns4cash/vivisect,cmaruti/vivisect,imjonsnooow/vivisect,pwns4cash/vivisect,atlas0fd00m/vivisect,atlas0fd00m/vivisect,vivisect/vivisect,bat-serjo/vivisect,joshuahoman/vivisect,HackerTool/vivisect,HackerTool/vivisect,vivisect/vivisect,HackerTool/vivisect,joshuahoman/vivisect,imjonsnooow/vivisect,cmaruti/vivisect,vivisect/vivisect,cmaruti/vivisect