iphlpapi: Changed return value of NotifyAddrChange() stub and added test cases. (try 3)

[Janne Hakonen]

This patch changes return value of NotifyAddrChange() function (which is
currently implemented as a stub) to ERROR_IO_PENDING. Handle output parameter
is also invalidated so that caller don't think that the call really succeeded.

The change corrects crashes with Anarchy Online, Awesomium and Google Chrome.

This same patch also contains test cases for the NotifyAddrChange() and
CancelIPChangeNotify() functions, with failing tests wrapped inside todo_wine.

CancelIPChangeNotify() can be used also to cancel NotifyRouteChange() calls,
but there is no test cases made for that yet.
---
 dlls/iphlpapi/iphlpapi_main.c  |    5 ++-
 dlls/iphlpapi/tests/iphlpapi.c |   87 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 88 insertions(+), 4 deletions(-)
 mode change 100644 => 100755 dlls/iphlpapi/tests/iphlpapi.c

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