[Bug 230631] www/newsboat: fails to build with libc++ 7

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230631

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: jbeich
Date: Tue Aug 14 21:29:42 UTC 2018
New revision: 477204
URL: https://svnweb.freebsd.org/changeset/ports/477204

Log:
  www/newsboat: unbreak with libc++ 7

  In file included from src/ttrss_api.cpp:1:
  In file included from include/ttrss_api.h:4:
  ./3rd-party/json.hpp:1201:9: error: static_assert failed "could not find
from_json() method in T's namespace"
          static_assert(sizeof(BasicJsonType) == 0,
          ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~
  ./3rd-party/json.hpp:1216:16: note: in instantiation of function template
specialization
'nlohmann::detail::from_json_fn::call<nlohmann::basic_json<std::map,
std::vector, std::__1::basic_string<char>, bool, long, unsigned long, double,
std::allocator, adl_serializer>, std::__1::basic_string_view<char,
std::__1::char_traits<char> > >' requested here
          return call(j, val, priority_tag<1> {});
                 ^
  ./3rd-party/json.hpp:9660:9: note: in instantiation of function template
specialization
'nlohmann::detail::from_json_fn::operator()<nlohmann::basic_json<std::map,
std::vector, std::__1::basic_string<char>, bool, long, unsigned long, double,
std::allocator, adl_serializer>, std::__1::basic_string_view<char,
std::__1::char_traits<char> > >' requested here
          ::nlohmann::from_json(std::forward<BasicJsonType>(j), val);
          ^
  ./3rd-party/json.hpp:12181:36: note: in instantiation of function template
specialization 'nlohmann::adl_serializer<std::__1::basic_string_view<char,
std::__1::char_traits<char> >, void>::from_json<const
nlohmann::basic_json<std::map, std::vector, std::__1::basic_string<char>, bool,
long, unsigned long, double, std::allocator, adl_serializer> &,
std::__1::basic_string_view<char, std::__1::char_traits<char> > >' requested
here
          JSONSerializer<ValueType>::from_json(*this, ret);
                                     ^
  ./3rd-party/json.hpp:12443:16: note: in instantiation of function template
specialization 'nlohmann::basic_json<std::map, std::vector,
std::__1::basic_string<char>, bool, long, unsigned long, double,
std::allocator, adl_serializer>::get<std::__1::basic_string_view<char,
std::__1::char_traits<char> >, std::__1::basic_string_view<char,
std::__1::char_traits<char> >, 0>' requested here
          return get<ValueType>();
                 ^
  /usr/include/c++/v1/string:875:29: note: in instantiation of function
template specialization 'nlohmann::basic_json<std::map, std::vector,
std::__1::basic_string<char>, bool, long, unsigned long, double,
std::allocator, adl_serializer>::operator
basic_string_view<std::__1::basic_string_view<char, std::__1::char_traits<char>
>, 0>' requested here
          {__self_view __sv = __t; return assign(__sv);}
                              ^
  src/ttrss_api.cpp:69:7: note: in instantiation of function template
specialization 'std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::operator=<nlohmann::basic_json<std::map,
std::vector, std::__1::basic_string<char>, bool, long, unsigned long, double,
std::allocator, adl_serializer>, void>' requested here
                  sid = content["session_id"];
                      ^

  PR:           230631
  Reported by:  antoine (via exp-run)
  Obtained from:        upstream (json)
  Approved by:  portmgr blanket

Changes:
  head/www/newsboat/files/patch-json-libc++7

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