internal/syscall/windows: implement SupportUnixSocket by enumerating protocols
windows.SupportUnixSocket is currently implemented using a Windows
version check. This approach is not reliable, see #27943 and #28061.
Also, it uses the undocumented RtlGetNtVersionNumbers API, which
we should try to avoid.
This PR implements SupportUnixSocket by enumerating the available
protocols and checking for AF_UNIX support.
Cq-Include-Trybots: luci.golang.try:gotip-windows-arm64
Change-Id: I76cd635067309f09571ad0eac4a5699450a2709a
Reviewed-on: https://go-review.googlesource.com/c/go/+/570075 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Alex Brainman <alex.brainman@gmail.com> Reviewed-by: Bryan Mills <bcmills@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>