MFH: r441680

net/samba43: Mark 4.2 and 4.3 deprecated

• Add deprecation date and message
• Update/simplify conflicts

PR: 219514
Approved by: timur (maintainer)
Security: 6f4d96c0-4062-11e7-b291-b499baebfeaf

Approved by: ports-secteam (with hat)