added simple maintainer script
handle scope-id of link-local addresses better

- SelectConnectionTypeIndex() in xdm/policy.c: documented the
  issue with Xorg servers providing link-local IPv6 addresss
  in the connectionAddresses list.

- NetworkAddressToName() in xdm/xdmcp.c: Handled scoped
  link-local IPv6 addresses without a scope-id as a
  connectionAddress by using getnameinfo() and the socket
  address of the originator of the MANAGE message to form
  the DISPLAY name.