mail/opensmtpd: update to 5.7.3p2 Details at https://github.com/OpenSMTPD/OpenSMTPD/issues/650 While at it, remove a stale patch that isn't applicable anymore. Upstream implements this logic already, and the patch doesn't actually patch anything. PR: 206816 Submitted by: sa.inbox@gmail.com Approved by: portmgr@