iphlpapi: Only call res_init() once per process

[Jason Green]

Original author: Mark Adams, TransGaming Technologies.

Mac OSX 10.4 has a nasty bug in its res_init() implementation where if
you call it more than once per process, it closes fd 0 on you.  This
only needs to be called once per process anyway, so we'll move it to
the ATTACH_PROCESS section.
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