ipmask::parse fix


git-svn-id: http://svn.code.sf.net/p/sauerbraten/code@5054 07af1644-1164-4067-b897-63bf4dc9b748
zip readlocalfileheader fix


git-svn-id: http://svn.code.sf.net/p/sauerbraten/code@5055 07af1644-1164-4067-b897-63bf4dc9b748