Updated to latest strl{cat|cpy} code of rsync:

Updated to latest strl{cat|cpy} code of rsync:
- Make sure that strlcpy() returns the right value when the bufsize is 0.
- Fixed a bug in strlcat() where it would not properly detect a no-change
  condition if called with an initial string longer than the specified
  size limit (due to an unsigned var's inability to go negative).
Patch by Florian Westphal, <westphal@foo.fh-furtwangen.de>.