Don't override ai_flags with hints.ai_flags

--- a/src/afindep.c
+++ b/src/afindep.c
@@ -154,7 +154,8 @@
 			src_hints.ai_flags    = AI_PASSIVE;
 			src_hints.ai_socktype = ptr->ai_socktype;
 			src_hints.ai_protocol = ptr->ai_protocol;
-			src_hints.ai_flags    = hints->ai_flags;
+			/* Don't override previous ai_flags */
+			src_hints.ai_flags    |= hints->ai_flags;
 
 			/* get the local IP address of the connection */
 			err = getaddrinfo(local_address, local_service,