[Swan-dev] adns.c, adns.h changes

[Tuomo Soini]

I just found out adns code was always compiled in because it used wrong
define checks to find out when DNSSEC support was in.

Now code works like it was supposed to do but this can really break
everything because now we won't compile ADNS code in with USE_DNSSEC
like we did before.

-- 
Tuomo Soini <tis at foobar.fi>
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