open_socket_in was attempting to try all the protocols returned from

getaddrinfo(), but only if a corresponding call to socket() returned one of
three *NOSUPPORT errno codes.  A Redhat 6.2 system was observed returning
EINVAL instead so it never went on to try IPv4.  This update adds EINVAL to
the list.  Question: why not always continue through the list regardless of
what errno is?

socket.c

@@ -298,6 +298,7 @@ static int open_socket_in(int type, int port, const char *bind_address,
 			case EPROTONOSUPPORT:
 			case EAFNOSUPPORT:
 			case EPFNOSUPPORT:
+			case EINVAL:
 				/* See if there's another address that will work... */
 				continue;
 			}