message: Fix compilation of caf-vec on MSVC
diff: #include "caf/all.hpp"
  -using std::cout;
  -using std::cerr;
  -using std::endl;
  using std::string;
  using namespace caf;
  @@ -550,12 +547,12 @@ expected<first_pass_result> first_pass(blocking_actor* self, std::istream& in,
  >> consume("start") >> skip_word
  >> consume("level =") >> skip_word >> consume("node = ")
  >> res.this_node >> skip_to_next_line)) {
  - cerr << "*** malformed log file, expect the first line to contain "
  - << "an INFO entry of the logger" << endl;
  + std::cerr << "*** malformed log file, expect the first line to contain "
  + << "an INFO entry of the logger" << std::endl;
  return sec::invalid_argument;
  }
  if (vl >= verbosity_level::informative)
  - aout(self) << "found node " << res.this_node << endl;
  + aout(self) << "found node " << res.this_node << std::endl;
  logger_id id;
  string message;
  while (in >> skip_word >> skip_word >> skip_word >> id
  @@ -571,7 +568,7 @@ expected<first_pass_result> first_pass(blocking_actor* self, std::istream& in,
  }
  if (vl >= verbosity_level::informative)
  aout(self) << "found " << res.entities.size() << " entities for node "
  - << res.this_node << endl;
  + << res.this_node << std::endl;
  return res;
  }
  @@ -621,7 +618,7 @@ void second_pass(blocking_actor* self, const group& grp,
  auto bcast = [&](const se_event& x) {
  if (vl >= verbosity_level::noisy)
  aout(self) << "broadcast event from " << nid
  - << ": " << deep_to_string(x) << endl;
  + << ": " << deep_to_string(x) << std::endl;
  if (self != nullptr)
  self->send(grp, x);
  };
  @@ -632,7 +629,7 @@ void second_pass(blocking_actor* self, const group& grp,
  // i.e., is a potential deadlock
  if (vl >= verbosity_level::noisy)
  aout(self) << "wait for send from another node matching fields "
  - << deep_to_string(fields) << endl;
  + << deep_to_string(fields) << std::endl;
  se_event* res = nullptr;
  self->receive_while([&] { return res == nullptr; })(
  [&](const se_event& x) {
  @@ -706,7 +703,7 @@ void second_pass(blocking_actor* self, const group& grp,
  in_flight_spawns.erase(i);
  } else {
  std::cerr << "*** cannot match init event to a previous spawn"
  - << endl;
  + << std::endl;
  }
  break;
  }
  @@ -767,7 +764,7 @@ struct config : public actor_system_config {
  void caf_main(actor_system& sys, const config& cfg) {
  using namespace std;
  if (cfg.output_file.empty()) {
  - cerr << "*** no output file specified" << endl;
  + cerr << "*** no output file specified" << std::endl;
  return;
  }
  verbosity_level vl;
  