ntp_io.c:

ntp_io.c:
  Bug #715 (& dupe 723):
  findlocalinterface() in update_interface can be replaced by
  a simple address to interface lookup. This avoids tripping
  over the Linux strategy to return the localhost address
  when attempting to send to an IPv6 address of a local interface.
  Additionally:
    synchronize debug output with reality
    avoid adding duplicate address entries to the address list
    declare more functions static to reduce name space pollution

bk: 4530a51fP3_h1Po4dNHAbynhQE-amQ