Use AI_ADDRCONFIG on Windows as well.

runtime/bin/socket_win.cc

Index: runtime/bin/socket_win.cc
diff --git a/runtime/bin/socket_win.cc b/runtime/bin/socket_win.cc
index da82b273b68ec6385beeb2252cec366a395d6706..7f1de2d94c4b97994551d90f09514306bad348db 100644
--- a/runtime/bin/socket_win.cc
+++ b/runtime/bin/socket_win.cc
@@ -233,11 +233,17 @@ AddressList<SocketAddress>* Socket::LookupAddress(const char* host,
   memset(&hints, 0, sizeof(hints));
   hints.ai_family = SocketAddress::FromType(type);
   hints.ai_socktype = SOCK_STREAM;
-  hints.ai_flags = 0;
+  hints.ai_flags = (AI_V4MAPPED | AI_ADDRCONFIG);
   hints.ai_protocol = IPPROTO_TCP;
   struct addrinfo* info = NULL;
   int status = getaddrinfo(host, 0, &hints, &info);
   if (status != 0) {
+    // We failed, try without AI_ADDRCONFIG. This can happen when looking up
+    // e.g. '::1', when there are no global IPv6 addresses.
+    hints.ai_flags = AI_V4MAPPED;
+    status = getaddrinfo(host, 0, &hints, &info);
+  }
+  if (status != 0) {
     ASSERT(*os_error == NULL);
     DWORD error_code = WSAGetLastError();
     SetLastError(error_code);