enable gdbserver debug in c/c++ source

Request:
```c
// same as gdbserver, wait gdb remote connect debug.
int main()
{
gdb_init(1234);


// stop
gdb_end();
}
```

Some time, 
1. manual command launch program not  inconvenient;
2. --attach pid also not  inconvenient;

I want enable gdbserver debug in source by c/c++ API.