MFH: r431990

dns/powerdns and dns/powerdns-recursor: unbreak build with clang 4.0

json11.cpp:153:24: error: invalid operands to binary expression ('nullptr_t' and 'nullptr_t')

return m_value < static_cast<const Value<tag, T> *>(other)->m_value;
       ~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

json11.cpp:209:5: note: in instantiation of member function 'json11::Value<json11::Json::Type::NUL,

  nullptr_t>::less' requested here
JsonNull() : Value(nullptr) {}
^

PR: 216071
Submitted by: cpm
Reported by: jbeich
Reviewed by: jbeich
Approved by: Ralf van der Enden <tremere@cainites.net> (maintainer)
Obtained from: upstream

Approved by: ports-secteam (blanket)