update README (#2316)

inisis

2024-12-19 1368a9bca48473d793f0c1d52df0a4739c747d16

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#define GFLAGS_DLL_DECLARE_FLAG
 
#include <iostream>
#include <gflags/gflags_declare.h>
 
DECLARE_string(message); // in gflags_delcare_test.cc
 
void print_message();
void print_message()
{
  std::cout << FLAGS_message << std::endl;
}