It seems there was a re-release of the source code archive on Github. While I don't understand why they did not just increase the patch level of the upstream source, I am happy that this circumstance was already fixed in ports head. What I am asking for here is, if it is possible to bring in this changes in 2017Q4 branch, too?
To portmgr@ - please merge r452766 and r452778 to 2017Q4. Thanks!
Closing as we have 2018Q1 now.