comms/conserver-com: Update for openssl 1.1.1 in 12-CURRENT.

• Add BSD3CLAUSE license (0mp)
• Switch to github from sourceforge (sbruno)
• portlint cleanups (bunch of people)

PR: 232158
Submitted by: 0mp
Reported by: jhb
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D17524