Fixed the way rsync handles iconv-conversion problems in the file-list:

- If the sender cannot convert a name, the discarding of the entry now
  occurs soon enough to avoid affecting the sender's list (which was
  causing the file-list on the receiving side to be out of sync).
- If the receiver cannot convert a name, its transformation of the name
  into an empty name (which indicates that the entry should be skipped)
  is no longer thwarted by the clean_fname() call (which was changing
  the name into a ".").