message: cppcheck: fix silent strerror call
  Return value of function strerror() is not used
diff: @@ -848,7 +848,7 @@ protected:
  #endif
  bytesSent= ::send( socketFD_, (void*)outputBuffer_, bytesToSend, MSG_NOSIGNAL );
  if ( -1 == bytesSent ) {
  - strerror( errno );
  + std::cerr << strerror( errno ) << "\n";
  return traits_type::eof();
  }
  #if defined (USE_SSL)
  @@ -2651,7 +2651,7 @@ void HTTPServer::run() {
  socklen_t sa_len = sizeof( struct sockaddr_in );
  int retval = ::accept( serverSocket_, (struct sockaddr*)&clientAddress, &sa_len );
  if ( -1 == retval ) {
  - ::strerror( errno );
  + std::cerr << ::strerror( errno ) << "\n";
  continue;
  }
  clientSocketFD = retval;
  @@ -2661,7 +2661,7 @@ void HTTPServer::run() {
  ::memset( ipbuf, 0, 16 );
  char const * resbuf = ::inet_ntop( AF_INET, &(clientAddress.sin_addr), ipbuf, INET_ADDRSTRLEN );
  if ( nullptr == resbuf ) {
  - ::strerror( errno );
  + std::cerr << ::strerror( errno ) << "\n";
  ::close( clientSocketFD );
  continue;
  }
  @@ -2738,7 +2738,7 @@ void HTTPSServer::run() {
  socklen_t sa_len = sizeof( struct sockaddr_in );
  int retval = ::accept( serverSocket_, (struct sockaddr*)&clientAddress, &sa_len );
  if ( -1 == retval ) {
  - ::strerror( errno );
  + std::cerr << strerror( errno ) << "\n";
  continue;
  }
  clientSocketFD = retval;
  @@ -2756,7 +2756,7 @@ void HTTPSServer::run() {
  memset( ipbuf, 0, 16 );
  char const * resbuf = ::inet_ntop( AF_INET, &(clientAddress.sin_addr), ipbuf, INET_ADDRSTRLEN );
  if ( nullptr == resbuf ) {
  - ::strerror( errno );
  + std::cerr << strerror( errno ) << "\n";
  ::close( clientSocketFD );
  continue;
  }
  