Re: wget2 | Add --bind-interface (#430)

[Tim Rühsen]

Tim Rühsen commented:


`config.bind_address` is a global option in the means that it is applied to 
every connection.

So what you would need is a function to set this value for the networking part 
of libwget (`libwget/net.c`). You would call this function from 
`src/options.c/init()`.

E.g. add a new function to net.c, `wget_tcp_set_bind_adddress()` to set the 
value from config.bind_address.
Oh, lol. There already is `void wget_tcp_set_bind_address(wget_tcp *tcp, const 
char *bind_address)`.

We already have --bind-address
```
        { "bind-address", &config.bind_address, parse_string, 1, 0,
                SECTION_DOWNLOAD,
                { "Bind to sockets to local address.\n",
                  "(default: automatic)\n"
                }
        },
```

So what you want to do is `--set-bind-interface`. So, add a setter for it in 
net.c and call it from wget.c/init().

Think about how we can test it in our test suite (I currently don't know how).

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