in --itemized-changes mode. If the item is not being updated,
either pass it along to the receiver (if we're the server) or just
call log_send().
- We reject an attempt to file-update any non-regular file, not just
dirs.
- Avoid the verbose "log the transfer" output if --log-format was
specified and log_before_transfer is in effect.
- Call log_send() with its new iflags arg.