net/freeradius-client: Update to 1.1.8
The old master sites no longer resolve, so use the upstream git tag.
Add two upstream fixes made after the tag: rc_avpair_gen() is now
iterative, it recursed per attribute on unverified replies, and
vendor-specific attributes reserve room for the VSA header.
Drop the local rc_nasaddress() patch, it has no consumer in the tree.
PR: 297676
Approved by: netch@portaone.com (maintainer timeout)
Sponsored by: Netzkommune GmbH