sockets.h: Add SOCKET_LIST_DGRAM

Change-Id: Ifc00b12403a105307fa12d14a52c6566094ba7c0
diff --git a/sockets.c b/sockets.c
index ef35220..e1f7ad3 100644
--- a/sockets.c
+++ b/sockets.c
@@ -750,6 +750,9 @@
     else
         ai.ai_flags |= AI_CANONNAME;
 
+    if (flags & SOCKET_LIST_DGRAM)
+        ai.ai_socktype = SOCK_DGRAM;
+
     while (1) {
         struct addrinfo  hints = ai;