[fpc-pascal] netdb, TCP, and DNS queries

[Michael Van Canneyt]

On Sun, 6 Dec 2020, Noel Duffy via fpc-pascal wrote:

> Hi all,
>
> Following up on the work I've being doing to add support for DNS queries over 
> TCP to netdb and to add support for querying all of the standard resource 
> types such as MX, SOA, TXT, NS, etc, I've added the proposed changes to a 
> note in the Bugtracker:
>
> https://bugs.freepascal.org/view.php?id=37906#c127368
>
> This isn't yet in patch form. I've just created a copy of netdb.pp and 
> renamed it to newnetdb.pp. I'm posting about it now to get some feedback on 
> it.

In general it looks good. 2 remarks:

I did see you removed the comments about byte order, I don't think 
that's a good idea, these comments have their use :-)

The second point is that you removed the USE_LIBC define.
The netdb unit works only with USE_LIBC on Android.

So it is imperative that this keeps working too. Maybe with a reduced API,
but it should work nonetheless.

Michael.