Returns MAC address by: - search local interfaces, or - send UDP packed that does not need linux privilege, then search local cache
solve https://bugs.winehq.org/show_bug.cgi?id=9418
files updated - /dlls/iphlpapi/iphlpapi_main.c - /dlls/iphlpapi/tests/iphlpapi.c
-- v11: iphlpapi.c: Add SendARP