Ignore pxenv_udp_open src_ip address,
since some NBPs (Altiris) pass in bogus data.

Index: etherboot-5.4.3/src/core/pxe_export.c
===================================================================
--- etherboot-5.4.3.orig/src/core/pxe_export.c	2008-07-08 11:14:57.000000000 -0700
+++ etherboot-5.4.3/src/core/pxe_export.c	2008-07-08 11:15:01.000000000 -0700
@@ -914,7 +914,7 @@
 	     udp_open->src_ip != arptable[ARP_CLIENT].ipaddr.s_addr ) {
 		/* Overwrite our IP address */
 		DBG ( " with new IP %@", udp_open->src_ip );
-		arptable[ARP_CLIENT].ipaddr.s_addr = udp_open->src_ip;
+		// arptable[ARP_CLIENT].ipaddr.s_addr = udp_open->src_ip;
 	}
 
 	udp_open->Status = PXENV_STATUS_SUCCESS;
