[ECOS] build_bootp_record() support dns server address

[Jonathan Larmour]

Andrew Lunn wrote:
> 
> Secondly, build_bootp_record() is a public API function. I have my IP
> addresses, network masks etc, stored in flash. I use this function to
> build a bootp record which i then pass to init_net(). Your change will
> break my and others code.

I hadn't realised that.

> I have a counter proposal. 
> 
> Two new CDL options. A bool CYGPKG_NS_DNS_DEFAULT which
> enables/disables the use of a default address. A data
> CYGDAT_NS_DNS_DEFAULT_SERVER which is the IP address of the server. 
> 
> init_all_network_interfaces() then has some code inside
> 
> #ifdef CYGPKG_NS_DNS_DEFAULT_SERVER
> 
> to turn the string into an struct in_addr and pass it to
> cyg_dns_res_init()

I prefer this then.

Jifl
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