net/rsync: Update to 3.1.3

Changelog:
SECURITY FIXES:

• Fixed a buffer overrun in the protocol's handling of xattr names and ensure that the received name is null terminated.
• Fix an issue with --protect-args where the user could specify the arg in the protected-arg list and short-circuit some of the arg-sanitizing code.
  
  BUG FIXES:
• Don't output about a new backup dir without appropriate info verbosity.
• Fixed some issues with the sort functions in support/rsyncstats script.
• Added a way to specify daemon config lists (e.g. users, groups, etc) that contain spaces (see "auth users" in the latest rsyncd.conf manpage).
• If a backup fails (e.g. full disk) rsync exits with an error.
• Fixed a problem with a doubled --fuzzy option combined with --link-dest.
• Avoid invalid output in the summary if either the start or end time had an error.
• We don't allow a popt alias to affect the --daemon or --server options.
• Fix daemon exclude code to disallow attribute changes in addition to disallowing transfers.
• Don't force nanoseconds to match if a non-transferred, non-checksummed file only passed the quick-check w/o comparing nanosecods.
  
  ENHANCEMENTS:
• Added the ability for rsync to compare nanosecond times in its file-check comparisons, and added support nanosecond times on Mac OS X.
• Added a short-option (-@) for --modify-window.
• Added the --checksum-choice=NAME[,NAME] option to choose the checksum algorithms.
• Added hashing of xattr names (with using -X) to improve the handling of files with large numbers of xattrs.
• Added a way to filter xattr names using include/exclude/filter rules (see the --xattrs option in the manpage for details).
• Added "daemon chroot|uid|gid" to the daemon config (in addition to the old chroot|uid|gid settings that affect the daemon's transfer process).
• Added "syslog tag" to the daemon configuration.
• Some manpage improvements.
  
  DEVELOPER RELATED:
• Tweak the "make" output when yodl isn't around to create the man pages.
• Changed an obsolete autoconf compile macro.
• Support newer yodl versions when converting man pages.

remove needless patch

*While here switch to DISTVERSION

PR: 225761
Reported by: os@ist.ac.at
Approved by: tcberner (mentor)
MFH: 2018Q1
Differential Revision: https://reviews.freebsd.org/D14324