Hi again,

To further illustrate my vision on a concept for unified asynch resolver
backends, I offer these two patches on top of Vsevolod Novikov's
unified_resolver_2.patch.

They're pretty large changes so I'll save them to get merged into master after
this pending release, and I've only yet tested them out when built with c-ares
but it shows two asynch resolver backends each implementing the single
Curl_resolver_* API that is now defined in lib/asyn.h.

Adding a new asynch resolver backend would be a matter of writing a new
lib/asyn-*.c file that implements the functions that provide that API. Someone
could for example rather easily try to implement 'adns' support now as
alternative to c-ares.

This unification is not yet complete even with these patches applied. I know a
few more little details to move into this but I think it is a good move to
make the asynch resolving less complicated in the ordinary code. It removes
lots of #ifdefs from code as well.

-- 
  / daniel.haxx.se

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