Golang net: broken windows-race builder

The windows-race builder broke about 2 weeks ago — this is marked as a first class port.

Looking at the logs, it seems a change in src/net could be the culprit, as the udpsock_test there is broken, specifying that WriteMsgUDPAddrPort / ReadMsgUDPAddrPort allocated an object when it shouldn't have.

Comment From: mrkfrmn

cc @neild from owners

Comment From: qmuntal

Probably my fault. Will fix.

Comment From: gopherbot

Change https://go.dev/cl/703195 mentions this issue: net,internal/poll: skip TestAllocs when race is enabled on Windows