call SetLastError in NotifyAddrChange/NotifyRouteChange, to make apps can get
WSA_IO_PENDING error code after async operation through GetLastError.
Thanks to Sebastian Lackner for comments.
superseded patch 107390.
---
dlls/iphlpapi/iphlpapi_main.c | 18 ++++++++++++++++--
dlls/iphlpapi/tests/iphlpapi.c | 39 +++++++++++++++++++++++----------------
2 files changed, 39 insertions(+), 18 deletions(-)