rpcrt4(1/2): iphlpapi is needed at most once per process, so dynamically load it and unload it when done

[Juan Lang]

This is a resend of the patch sent here:
http://www.winehq.org/pipermail/wine-patches/2008-August/059188.html

Rob said he's okay with it, and I didn't get any other comments.  I
made the changelog a little more descriptive just in case.  Another
other comments?
--Juan
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