[lwip-devel] [task #7017] Implement DNS client

[Simon Goldschmidt]

Follow-up Comment #63, task #7017 (project lwip):

The new code works fine!

I did some changes too (see commit log), mainly function documentation,
coding style and some attempts to make the code smaller, hope you don't mind!

What remains is a check that the numerous size-defines (dns table size,
number of dns servers) fit into the u8_t which is used to index them (I added
a precompiler check for that, maybe that's already enough?).

Also, dns_seqno (currently an u8_t) can overflow when more than 256 queries
are done. But since the only side-effect is that a new entry gets overwritten,
it's not that important...

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