Warnings purge

src/include/gpxe/icmp6.h

 	/* "Compulsory" options */
 	uint8_t opt_type;
 	uint8_t opt_len;
-#warning hack alert
+  /* FIXME:  hack alert */
 	uint8_t opt_ll_addr[6];
 };
 
 	struct in6_addr target;
 	uint8_t opt_type;
 	uint8_t opt_len;
-#warning hack alert
+  /* FIXME:  hack alert */
 	uint8_t opt_ll_addr[6];
 };
 

src/include/gpxe/ndp.h

 #define NDP_STATE_PROBE 4
 #define NDP_STATE_STALE 5
 
-static struct ndp_entry * ndp_find_entry ( struct in6_addr *in6 );
 int ndp_resolve ( struct net_device *netdev, struct in6_addr *src,
 		  struct in6_addr *dest, void *dest_ll_addr );
 int ndp_process_advert ( struct io_buffer *iobuf, struct sockaddr_tcpip *st_src,