Update net/powerdns-recursor to 4.1.0.
Lua support no longer optional.

PowerDNS Recursor 4.1.0
===========================================================

- Improved DNSSEC support
- Improved documentation
- Improved RPZ support
- Improved EDNS Client Subnet support
- Support for Botan 2.x (and removal of support for Botan 1.10)
- SNMP support
- Lua engine has gained access to more parts of the recursor
- CPU affinity can now be specified
- TCP Fast Open support
- New performance metrics

Full changelog:

  https://doc.powerdns.com/recursor/changelog/4.1.html

PowerDNS Recursor 4.0.7
===========================================================

- Insufficient validation of DNSSEC signatures (CVE-2017-15090)
- Cross-Site Scripting in the web interface (CVE-2017-15092)
- Configuration file injection in the API (CVE-2017-15093)
- Memory leak in DNSSEC parsing (CVE-2017-15094)

Bug fixes
- Update rec_control manpage
- Check in the detected OpenSSL/libcrypto for ECDSA
- Make more specific Netmasks < to less specific ones
- Fix validation at the exact RRSIG inception or expiration time
- Lowercase all outgoing qnames when lowercase-outgoing is set
- Fix libatomic detection on ppc64
- Edit configname definition to include the 'config-name' argument

Improvements
- Extract nested exception from Luawrapper
- Use explicit yes for default-enabled settings
- Throw an error when lua-conf-file can't be loaded
- get-remote-ring's "other" report should only have two items.
- PowerDNS sdig does not truncate trailing bits of EDNS Client Subnet
  mask
- Only increase no-packet-error on the first read
- Add support for Botan 2.x
- Add more information to recursor cache dumps
- Fix typo in two log messages
- Add help text on autodetecting systemd support
- Be more resilient with broken auths
- Remove pdns.PASS and pdns.TRUNCATE
- Improve dnsbulktest experience in travis for more robustness
- Create socket-dir from init-script
- b.root renumbering, effective 2017-10-24
- Don't retry security polling too often when it fails

(fhajny)