fix conditionals

ok deraadt@

Handle case where no hint is passed in. Found as a crash of fdm by jturner@

getaddrinfo() should not res_init() unconditionally, but allow lower
layers to decide. The request could be AI_NUMERICHOST. [And the process
could be tame()-constrained to not open /etc/resolv.conf

getaddrinfo() should not res_init() unconditionally, but allow lower
layers to decide. The request could be AI_NUMERICHOST. [And the process
could be tame()-constrained to not open /etc/resolv.conf]
ok eric guenther

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Finish wrapping <netdb.h> so that calls go direct and the symbols are all weak

Make the asr API public. Install asr.h to /usr/include.h and manpages.
Include tweaks suggested by mpi@

ok deraadt@

Cleanup and simplify the API to be exposed. Use better names for
structures, functions and defines.

discussed with and ok deraadt@ guenther@

Make some symbols static and prefix all visible symbols with asr_
to prevent collisions with third-party programs.

suggested by sthen@, ok theo@

Add minimal support for _res setup and update.

Change res_init() to initialize the _res structure on first call, and
udpate the global async context if changes were made by the user. All
resolver fu

Add minimal support for _res setup and update.

Change res_init() to initialize the _res structure on first call, and
udpate the global async context if changes were made by the user. All
resolver functions now call res_init() internally.

fixes issue spotted by otto@

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split asr_resolver.c into different files to overlay the libc/net
resolver implementation.