Revision 500213

sysutils/afio: update to 2.5.2

ChangeLog (https://github.com/kholtman/afio/blob/master/ANNOUNCE-2.5.2):

* security improvements for the handling of archives from unstrusted
  sources

* when making multivolume archives, added %V feature to include the
  volume number in subsequent volume file names

* various bug and portability fixes

PR:	237324
Submitted by:	takefu@airport.fm
Approved by:	portmaster@bsdforge.com (maintainer, timeout 10 days)