remove msvc6 warnings about difference of signedness of pointer target types  (zip.c)
remove msvc6 warnings about difference of signedness of pointer target types
 (zip.c)


git-svn-id: c79564a500b7e594ddd40d64e0429b877c6247ac@148 1529d479-2984-44b7-a8f3-1f17ffde0828

Distrotech/zziplib,Distrotech/zziplib,Distrotech/zziplib,Distrotech/zziplib