It is now Possible to enable, thanks to three commits that do comparable work to the above links. Fernet is not enabled by default yet, though, it has to be a deliberate decision.
This bugzilla has been removed from the release and needs to be reviewed and Triaged for another Target Release.
This merged upstream in mid-March. Marking as POST.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.