iphlpapi: Changed return value of NotifyAddrChange() stub and added test cases.

[Janne Hakonen]

This patch changes return value of NotifyAddrChange() function (which is
currently implemented as a stub) to ERROR_IO_PENDING.
The change corrects crashes with Anarchy Online, Awesomium and Google Chrome.

The same patch also contains test cases for the NotifyAddrChange() function,
with failing tests wrapped inside todo_wine.
---
 dlls/iphlpapi/iphlpapi_main.c  |    2 +-
 dlls/iphlpapi/tests/iphlpapi.c |   93 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 91 insertions(+), 4 deletions(-)
 mode change 100644 => 100755 dlls/iphlpapi/tests/iphlpapi.c

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