dns/powerdns: Fix build with LibreSSL

• Add upstream patch 115f658ee2000a4cdcc13e999da50b3634c6a907
• Patch dns/powerdns-recursor as well

PR: 212016
Submitted by: Ralf van der Enden <tremere@cainites.net> (maintainer)
Reported by: Ralf van der Enden <tremere@cainites.net> (maintainer)
MFH: 2016Q3