powerdns: updated to 4.1.8

4.1.8
Bug Fixes
Fix rectify for ENT records in narrow zones.
Prevent leak of file descriptor if running out of ports for incoming AXFR.
EL6: fix CXXFLAGS to build with compiler optimizations.
Fix API search failed with 窶廚ommands out of sync; you can窶冲 run this command now窶�.
Fix invalid SOA record in MySQL which prevented the authoritative server from starting.
Plug mysql_thread_init memory leak.
Correctly interpret an empty AXFR response to an IXFR query.
Fix replying from ANY address for non-standard port.
Do not compress the root.
Fix dot stripping in setcontent().

4.1.7
Bug Fixes
Insufficient validation in the HTTP remote backend (CVE-2019-3871, PowerDNS Security Advisory 2019-03)

(adam)