TIL traceroute.8 has one of the oldest liceses, predating BSD-4-Clause!
The SPDX tag was not even on Wikipedia. These are all the files I could
find in the tree with git grep that look like the license reported on
the SPDX website, including one that was misfiled.

MFC after: 3 days
Reported by: brooks
Ref: https://spdx.org/licenses/BSD-4.3TAHOE.html