iphlpapi: Implement GetBestInterfaceEx.

[Robert Shearman]

---
  dlls/iphlpapi/iphlpapi.spec   |    1 +
  dlls/iphlpapi/iphlpapi_main.c |   40 
+++++++++++++++++++++++++++++++++++-----
  include/iphlpapi.h            |   10 ++++++++++
  3 files changed, 46 insertions(+), 5 deletions(-)

This is needed by Outlook 2007.
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