std.os.windows: restore sendmsg, sendto, recvfrom

These regressed with 1a998886c863a1829d649f196093f1058cd9cf13

I'm not ready to tackle std.posix quite yet
5f6e3245d1Andrew Kelley committed on 7/15/2025, 9:24:06 PMparentd4a191f
1 file changedLine totals unavailable