ws2_32: don't assume AI_V4MAPPED is available

[Austin English]

-- 
-Austin
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diff --git a/dlls/ws2_32/socket.c b/dlls/ws2_32/socket.c
index d5e9fd1..d78d9cd 100644
--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -529,7 +529,9 @@ static const int ws_aiflag_map[][2] =
 #ifdef AI_NUMERICSERV
     MAP_OPTION( AI_NUMERICSERV ),
 #endif
+#ifdef  AI_V4MAPPED
     MAP_OPTION( AI_V4MAPPED ),
+#endif
     MAP_OPTION( AI_ADDRCONFIG ),
 };