Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58635
(Note: in Windows SDK this is defined as ULONG WINAPI SetPerTcp6ConnectionEStats(.,.,., PUCHAR Rw .,.,.) so ULONG instead of DWORD, and PUCHAR instead of BYTE, but I conformed to the notation as currently in wine's iphlpapi.h)
-- v3: iphlpapi: Add stub for SetPerTcp6ConnectionEStats.