MFH: r448580

• Update to 1.2.0
• Remove patch that was upstreamed
• Switch from devel/llvm39 to devel/llvm40 when building on 10.3
• Update WWW in pkg-descr

Changes: https://mailman.powerdns.com/pipermail/dnsdist/2017-August/000358.html

Security: CVE-2016-7069
Security: CVE-2017-7557

Approved by: ports-secteam (delphij)